TOBRINER, J.
The jury convicted defendant of first degree robbery and of the first degree murder of Police Officer Eugene McKnight in Sacramento on July 23, 1963, and fixed the penalty at death. His appeal is automatic. (Pen. Code, §1239, subd. (b).) Defendant presents manifold contentions relating to his guilt trial, but we do not find prejudicial error in the conduct of the guilt trial. We must reverse the judgment as to penalty, however, because the trial court excluded veniremen from the jury panel in violation of the principles [768]*768set forth in Witherspoon v. Illinois (1968) 391 U.S. 510 [20 L.Ed.2d 776, 88 S.Ct. 1770].
Defendant shot 'Officer McKnight after a brief struggle in the parking lot of a Lucky Market at about 7 p.m., moments after eodefendant Turner1 robbed the market’s cash registers at gunpoint. Although he had been in the general'vicinity of the checkstands during the robbery, defendant displayed no weapon and played no active role. He followed Turner out of the market a few seconds after Turner emptied the last register. The prosecution sought to prove both that defendant premeditated the killing during the moments of struggle and that the killing occurred during the escape phase of the robbery. The prosecution contended that Turner and defendant jointly planned and committed the robbery and that defendant was to serve as a lookout, ready to assist Turner in ease of emergency. Schader testified in his own defense that he had planned to commit a robbery with Turner and indeed was casing the market for an anticipated later robbery, but asserted that he had no idea that Turner would commit ther particular robbery at the time it actually occurred. Defendant admitted cocking his pistol during the struggle, but claimed that the shooting was accidental.
After defendant offered his explanation for his presence at the scene of the robbery, the trial court permitted the prosecution, over defendant’s objection, to engage in two lines of cross-examination which defendant assigns as reversible error.
The prosecutor cross-examined defendant upon the details of a robbery for which defendant was convicted in 1957. He offered the testimony “to show common scheme, plan, or design; and most particularly, to show intent at the time of the offense charged.” The trial court permitted the prosecutor to inquire into similarities in the two offenses: in each ease, the robbers chose a supermarket as the target; the defendant worked with a single partner, a relative; the perpetrators used a stolen car for escape; one partner robbed cash registers, displaying a loaded pistol which was subsequently concealed; the other partner, standing by unobtrusively, but. armed with a loaded pistol, was available to participate in case of trouble. The prosecutor used the testimony thus obtained in his vigorous argument to the jury that defendant in the instant robbery “played the same role that Uncle Gilbert played down in Los Angeles, in an identical robbery [769]*769. . . ready to put a couple through the celling if somebody panicked. ’ ’
The prosecution also introduced into evidence, a conditional sales contract for a red Cadillac convertible which showed that defendant faced a payment of $900 several days after the robbery. The People cross-examined defendant about this document. In his closing argument to the jury, the prosecutor urged that the impending payment formed the motive for the robbery. He heavily emphasized the rhetorical question, “What did he put in the scales of justice — a big red Cadillac on one side, and the life of a human being, Officer McKnight, on the other 1 ’ ’
Defendant attacks both lines of cross-examination as beyond the scope of direct examination; he objects to the admission of the conditional sales contract, and the concomittant cross-examination on the further ground that the contract was discovered as the fruit of an interrogation previously held by this court to have been conducted in violation of defendant’s constitutional rights (People v. Schader (1965) 62 Cal.2d 716 [44 Cal.Rptr. 193, 401 P.2d 665]). In view of his admission of his general intention to commit robbery, defendant argues that cross-examination upon the details of the prior robbery could not fall under any exception to the general rule proscribing close inquiry into prior convictions. We explain why we uphold the cross-examination upon the details of the prior robbery; we find the admission of the sales contract erroneous but not prejudicial.
1. Alleged improper general scope of cross-examination
Setting aside for the moment the special rules pertaining to the admissibility of evidence of fruits of improper interrogation and of prior felony convictions, we find that general principles delimiting the scope of permissible cross-examination justified the prosecutor’s inquiry.
We are not unmindful of a basic principle of criminal justice which makes the provision of former Penal Code section 1323 (now see Evid. Code, §773, subd. (a)), limiting cross-examination of a defendant to “those matters about which he was examined in chief,” an indispensable ally of the federal and state constitutional rights guaranteeing that a person shall not “be compelled in any criminal case to be a witness against himself.” (Cal. Const., art. I, §13; U. S. Const., 5th Amend.; see People v. Arrighini (1898) 122 Cal. 121, 126 [54 P. 591]; People v. Sims (1958) 165 Cal.App.2d [770]*770108, 113 [331 P.2d 799].) We reeognize, of course, with the United States Supreme Court, “that the American system of criminal prosecution is accusatorial, not inquisitorial, and that the Fifth Amendment privilege is its essential mainstay. . . . Governments, state and federal, are thus constitutionally compelled to establish guilt by evidence independently and freely secured, and may not by coercion prove a charge against the accused out of his own mouth. ’ ’ (Malloy v. Hogan (1964) 378 U.S. 1, 7-8 [12 L.Ed.2d 653, 658-659, 84 S.Ct. 1489].) The People must “shoulder the entire load” of their burden of proof in their case in chief, without assistance either from the defendant’s silence or from his compelled testimony. (Tehan v. Shott (1966) 382 U.S. 406, 415 [15 L.Ed.2d 453, 459, 86 S.Ct. 459]; Griffin v. California (1965) 380 U.S. 609 [14 L.Ed.2d 106, 85 S.Ct. 1229]; Murphy v. Waterfront Com. (1964) 378 U.S. 52 [12 L.Ed.2d 678, 84 S.Ct. 1594]; 8 Wigmore, Evidence (McNaughton rev. 1961) p. 317.)
Even when a defendant chooses to offer testimony on his own behalf, the privilege against self-incrimination serves “to prevent the prosecution from questioning the defendant upon the case generally, and in effect making him its own witness.” (People v. Gallagher (1893) 100 Cal. 466, 475 [35 P. 80]; People v. O’Brien (1885) 66 Cal. 602 [6 P. 695]; People v. Sims, supra, 165 Cal.App.2d 108, 113.) Such general compelled cross-examination would not only post the same “cruel trilemma of self-accusation, perjury or contempt” recognized in Murphy v. Waterfront Com., supra, 378 U.S. 52, 55 [12 L.Ed.2d 678, 681, 84 S.Ct. 1594]; it would also penalize and thereby deter a defendant’s assertion of his right to take the witness stand to explain or contradict a particular aspect of the case against him.2
None of these fundamental principles, however, imply that when a defendant voluntarily testifies in his own defense the People may not fully amplify his testimony by inquiring into the facts and circumstances surrounding his assertions, or by introducing evidence through cross-examination which explains or refutes his statements or the inferences which may necessarily be drawn from them. The provision of former Penal Code section 1323 ‘ ‘ does not mean that the cross-examination must be confined to a mere categorial review of [771]*771the matters, dates or times mentioned in the direct examination- ... It may be directed to the eliciting of any matter which may tend to overcome or qualify the effect of the testimony given by him on direct examination.” (People v. Pike (1962) 58 Cal.2d 70, 90 [22 Cal.Rptr. 664, 372 P.2d 656]; People v. Zerillo (1950) 36 Cal.2d 222, 228 [223 P.2d 223].)3
Defendant took the stand to meet the People’s evidence which showed that he was present and armed during the robbery, that he fled immediately thereafter, and that he shot Officer McKnight. His testimony covered events and circumstances beginning with his conspiracy to commit a robbery with eodefendant Turner, through his activities in easing the market, his alleged surprise when he discovered that Turner had decided to commit the robbery by himself then and there, and his apprehension in the parking lot by Officer McKnight, and beyond his struggle and killing of the police officer. Such complete direct testimony placed in issue his motives, intent and state of mind during the robbery. Cross-examination which revealed those motives, intent and state of mind was therefore not prohibited under general strictures limiting the scope of cross-examination. (See People v. Perez (1967) 65 Cal.2d 615, 621 [55 Cal.Rptr. 909, 422 P.2d 597], cert. granted (1968) 390 U.S. 942 [19 L.Ed.2d 1131, 88 S.Ct. 1055]; People v. Ing (1967) 65 Cal.2d 603, 611 [55 Cal.Rptr. 902, 422 P.2d 590].)
Defendant contends alternatively that other, more specific rules render impermissible cross-examination upon the details of his prior conviction and upon the conditional sales contract. We deal first with the details of the prior conviction.
2. Alleged improper admission of details of prior robbery.
We point out that since the cross-examination upon the details of the prior robbery possessed sufficient probative value to outweigh its obviously prejudicial effect, the trial court properly admitted it. We show that the prosecution, in order to overcome defendant’s claim that he did not participate in the robbery that actually occurred, presented evidence of a common modus operandi to prove defendant’s guilty knowledge, his intent, and his state of mind during the killing of Officer McKnight.
[772]*772We begin with the basic premise that, save for certain recognized exceptions, evidence of other offenses may not be introduced in a criminal prosecution. 4 Obviously such evidence of other conduct should be excuded if it does not substantially tend to prove any fact other than the criminal character of the accused. “ [T]he defendant can be tried for no other offense than that [with] which he is charged.” (People v. Albertson, supra, 23 Cal.2d 550, 576.) He should not be confronted with attempted proof of other offenses interjected only to prove a criminal propensity that might have led him to the commission of other crimes. 5 “General bad character . . . has not yet become a criminal offense in our scheme.” (Michelson v. United States (1948) 335 U.S. 469, 489 [93 L.Ed. 168, 180, 69 S.Ct. 213] (Eutledge, J., dissenting).) We exclude such evidence of other crimes not because it lacks probative value but because its prejudicial effect outweighs its probative value. 6 We have thus reached [773]*773the conclusion that the risk of convicting the innocent by the admission of evidence of other; offenses is sufficiently imminent for us to forego the slight marginal gain in punishing the guilty.7
We recognize, however, exceptions to the basic rule. If a defendant chooses to testify, the People may impeach his credibility by showing that he has previously been convicted of a felony. Even here, however, impeachment evidence of prior felony convictions must be limited to identification of the conviction, and “the courts will be zealous to insure that the prosecuting attorney is not permitted to delve into the details and circumstances of the prior crime (People v. David (1939) 12 Cal.2d 639, 646 ...)....” (People v. Smith (1966) 63 Cal.2d 779, 790 [48 Cal.Rptr. 382, 409 P.2d 222].)
The prosecutor in the instant case, by inquiring into the details of the prior robbery, sought to take advantage of a broader exception to the basic rule of exclusion. Generally stated, this exception permits the People to adduce as circumstantial proof of the crime charged evidence encompassing the commission of a similar or related offense when the probative value of such evidence outweighs its prejudicial effect. (People v. Haston, supra, 69 Cal.2d 233, 243; People v. Cramer, supra, 67 Cal.2d 126, 129; People v. Kelley, supra, 66 Cal.2d 232, 238; People v. McCaughan, supra, 49 Cal.2d 409, [774]*774421; People v. Sykes, supra, 44 Cal.2d 166, 175 (Traynor, J., dissenting); People v. Westek, supra, 31 Cal.2d 469, 476; Evid. Code, § 352.) This balancing test is necessarily particularistic, depending not upon mechanically automatic rules, but upon the trial court’s consideration of the unique facts and issues , of each case according to the guidelines which we summarize below.
Admissibility depends “not merely on whether the evidence comes within certain categories which constitute exceptions to the rule of exclusion” (State v. Goebel (1950) 36 Wn.2d 367, 379 [218 P.2d 300]; see also Adkins v. Brett (1920) 184 Cal. 252, 255-256 [193 P. 251]) because most of the many kinds of traits common between offenses- — modus operandi, peculiar behavior, victim, plan, scheme, design, time, and geographical proximity, for example, — may be used in different cases to prove one of any number of issues: identity, commission of an act, intent, knowledge, motive, premeditation, etc. (1 Wig-more, Evidence (3d ed. 1940) §§215-217, pp. 710-719.) “If both justice and predictability of decision are to be served, rigidity of tests of admission and exclusion, in our opinion, is not the answer. We believe that whenever the quarrel is between relevancy and the policy of the law to protect the accused against bias and prejudice likely to be engendered from the admission of relevant evidence, a balancing process must take place — a weighing of the probative value of the evidence offered against the harm it is likely to cause. When its probative value, addressed to the crime charged, is great to prove a vital issue as compared with the lesser likelihood that a jury will be led astray and convict an innocent man because of his bad record, the evidence should be admitted.” (People v. Sheets (1967) 251 Cal.App.2d 759, 764-765 [59 Cal.Rptr. 777] see also People v. Sykes, supra, 44 Cal.2d 166, 174-175 (Traynor, J., dissenting).)
Probative value and prejudice obviously are not commodities subject to quantitative measurement. Nonetheless, we may identify some of the guidelines which courts follow in performing the balancing process described generally above. The chief elements of probative value are relevance, materiality and necessity.8
[775]*775Before permitting the jury to hear evidence of other offenses the court must ascertain that the evidence (a) “tends logically, naturally and by reasonable inference”' to prove the issue upon which it is offered;9 (b) is offered upon an issue which will ultimately, prove to be material to the People’s case;10 and (e) is not merely 'cumulative with respect to other evidence which the People may use to prove the same issue.11
In determining relevance, the trial court must look behind the label describing the kind of similarity or relation between the other offense and the charged offense;- it must examine the precise elements of similarity between the offenses with respect to the issue for which the evidence is proffered and satisfy itself that each link of the chain of inference between the former and the latter is reasonably strong.12
In order to assess materiality, the court must consider not merely the elements of the offense, but also the defendant’s testimonial admissions.13 Some commentators [776]*776have suggested that if the People propose to introduce evidence of another offense in its ease in chief, the court should permit the defendant to stipulate the truth of the issue which the People seek to prove.14
In the instant ease, the prosecuting attorney stated the purposes of his inquiry into the details of defendant’s prior robbery as follows: “to show common scheme, plan, or design; and most particularly, to show intent at the time of the offense charged.” We conclude that the evidence could have been properly admitted as proof of a common modus operandi offered to show the fact of defendant’s participation in the instant robbery; his knowledge of, and subsequent join-der in, a robbery initiated by his codefendant; and his awareness of apprehension by a police officer and hence his [777]*777premeditation in committing the killing. It is immaterial that the court’s ruling, at the time it was made, rested on an insufficient basis, since the prosecuting attorney did not explain, and the court did not inquire into, the nature of the similarity of the prior offense and the precise issue for which it was offered. It is also immaterial that the court erred in permitting the prosecutor to explain the purpose of the evidence within the hearing of the jury before ruling on its admissibility. “The evidence having been properly received against [the defendant], the ground of the court’s ruling is immaterial.” (Wilcox v. Berry (1948) 32 Cal.2d 189, 192 [195 P.2d 414].)
The cross-examination revealed that defendant had played the role of the active partner in a prior supermarket robbery committed with his uncle. The uncle, like defendant in the instant offense, remained unobtrusively in the general area of the checkstands, armed with a pistol, presumably prepared to assist the active partner in ease of difficulty. The evidence thus presented the probative inference that (1) defendant had previously participated in a robbery, (2) he was aware of this method of committing robbery, and therefore, since (3) the instant offense was characterized by the same circumstances, either (4) his involvement in these circumstances was not innocent as he claimed, but that of an active accomplice, or (5) his previous experience caused him to know that a robbery was in progress and he joined in the commission of the crime, playing the role of “covering” that his uncle played previously. The evidence presented another probative inference: since at the time he left the supermarket his previous experience caused him to know that a robbery had been' committed, he knew that when he was stopped in the parking lot he had been apprehended, and as a suspected accomplice he killed with deliberation and premeditation in order to effectuate his escape.
In impeaching defendant’s testimony, the People could properly have adduced the fact that defendant had been convicted of a prior robbery. The prejudice caused by the additional inquiry into the details' of the robbery was outweighed by its probative value. Defendant’s testimony denying active participation in the robbery, and his assertion that the killing occurred accidentally, did not deprive the evidence of its materiality. The evidence was not merely cumulative of other proof on the same issues, but necessary to the People’s case. We therefore conclude that the trial court properly admitted the cross-examination.
[778]*7783. Alleged improper admission of conditional sales contract obtained through unlawful interrogation
The record reveals that police learned of the conditional sales contract during the interrogation of defendant that we held violated his rights to counsel and to remain silent. (People v. Schader, supra, 62 Cal.2d 716, 727 ).
The fruits of an illegally conducted interrogation are no less inadmissible during the trial of the declarant than his statements themselves. Although they lack the element of potential unreliability inherent in the words of a confession, the physical byproducts of illegally obtained statements must be excluded for otherwise similar reasons. To protect the right of an accused “ ‘to remain silent unless he chooses to speak in the unfettered exercise of his own will[,] ’ ... to maintain a ‘fair state-individual balance,’ to require the government ‘to shoulder the entire load,’ ... to respect the inviolability of the human personality, our accusatory system of criminal justice demands that the government seeking to pjmish an individual produce the evidence against him by its own independent labors, rather than by the cruel, simple expedient of compelling it from his own mouth” (Miranda v. Arizona (1966) 384 U.S. 436, 460 [16 L.Ed.2d 694, 715, 86 S.Ct. 1602, 10 A.L.R.3d 974]). The exclusionary rule is applied to the fruits as well as the words of an illegally obtained confession. A contrary rule would undermine the rights to counsel and to remain silent by.providing police the simple expedient of conducting illegal interrogations for the purpose of obtaining physical evidence of guilt while foregoing the use at trial of the statements of the accused.
In People v. Buchanan (1966) 63 Cal.2d 880, 887 [48 Cal.Rptr. 733, 409 P.2d 957], we stated: ‘‘It is obvious that, since the gun was secured by police as a result of the statement obtained in violation of the rule of People v. Dorado, supra, 62 Cal.2d 338 [42 Cal.Rptr. 169, 398 P.2d 361], it too should have been excluded as the ‘poisonous fruit’ of the illegal statement. (Cf. People v. Bilderbach (1965) 62 Cal.2d 757, 767-768 [44 Cal.Rptr. 313, 401 P.2d 921]; People v. Ditson (1962) 57 Cal.2d 415, 439 [20 Cal.Rptr. 165, 369 P.2d 714]; Wong Sun v. United States (1963) 371 U.S. 471, 485 [83 S.Ct. 407, 9 L.Ed.2d 441]; Nardone v. United States (1939) 308 U.S. 338, 340-341 [60 S.Ct. 266, 84 L.Ed.2d 307].) This conclusion inevitably follows from the rule established in Do-rado.” We also cited the statement of the New York Court of [779]*779Appeals that “under the circumstances, it is incumbent upon the District Attorney to show that the location of the guns was discovered through a source untainted by the admissions:” (People v. Robinson (1963) 13 N.Y.2d 296, 301 [246 N.Y.S.2d 623, 196 N.E.2d 261].)
The prosecutor failed to show that the conditional sales contract and its contents were discovered “from an independent source” or that the discovery had “become so attenuated as to dissipate, the taint.” (Wong Sun v. United States, supra, 371 U.S. 471, 487 [9 L.Ed.2d 441, 455, 83 S.Ct. 407].) The Attorney General only speculates-that the registration on defendant’s ear “would show both, a legal owner and an equitable owner,” and, that the police, therefore, might have been able to discover the contract if they had not learned of it through the interrogation. The purposes of Dorado and Escobedo preclude the eradication of the taint upon the illegally obtained sales contract on the basis of such sheer hypothesis.
We cannot hold, however, that defendant suffered prejudice from the error in permitting cross-examination upon the sales contract. Facing, an overwhelming showing of his presence at the scene of the robbery and of his killing the police officer, defendant chose the defense that he had not participated in the robbery that actually occurred although he had planned to commit a robbery, and that his shooting of the. police officer was accidental. In the context of such a defense, evidence which established that defendant harbored a motive to commit a robbery in order to meet a payment due on a conditional sales contract merely confirmed defendant’s admission of the same fact; it added nothing to the-People’s ease, nor did it detract from the defense. Beyond a reasonable doubt, the error did not contribute to the verdict on the guilt trial. (Chapman v. California (1967) 386 U.S. 18, 24 [17 L.Ed.2d 705, 710, 87 S.Ct. 824, 24 A.L.R.3d 1065]; People v. Modesto (1967) 66 Cal.2d 695, 714 [59 Cal.Rptr. 124, 427 P.2d 788].)
4. Alleged improper admission of articles seized from defendant’s car
Defendant attacks the trial court’s admission into evidence of items seized from defendant’s car four hours subsequent to his arrest, after a police officer had towed the car to the impound garage. The items included defendant’s orange shirt, pearl buttons from the shirt, sunglasses, a cap, and makeup in a box. Defendant contends that because the evidence was seized at a time and place remote from the arrest, it [780]*780was not admissible as the product of a search incident to the arrest. He urges us to follow Preston v. United States (1964) 376 U.S. 364 [11 L.Ed.2d 777, 84 S.Ct. 881], and People v. Burke (1964) 61 Cal.2d 575 [39 Cal.Rptr. 531, 394 P.2d 67], in holding unlawful a vehicle search conducted at a police station hours after an arrest.
We need not decide, however, whether the evidence in the instant case had been obtained unlawfully, since it could not have prejudiced defendant’s case; indeed defendant fails to suggest any source of prejudice. The items could only have tended to establish the truth of issues admitted by defendant, his identity as the culprit and his general intention to commit a robbery. Defendant admitted that he fired the fatal shot, and he testified that in planning the robbery they 4 ‘needed some objects that would help cover up our features” and purchased caps, sunglasses, and- makeup, and we do not believe that the prosecution’s introduction into evidence of these items contributed to defendant’s decision to adopt the position taken. (Cf. People v. Spencer (1967) 66 Cal.2d 158, 168 [57 Cal.Rptr. 163, 424 P.2d 715].) His defense was that he did not participate in the robbery that actually occurred and that he fired the fatal shot accidentally. Upon these issues, the seized evidence had no bearing whatsoever. We conclude that the error was harmless beyond a reasonable doubt. (Chapman v. California, supra, 386 U.S. 18, 23 [17 L.Ed.2d 705, 710, 87 S.Ct. 824, 24 A.L.R.3d 1065]; People v. Modesto, supra, 66 Cal.2d 695, 714.)
5. Alleged erroneous admission of morgue photographs
At the conclusion of the defendant’s case the court admitted into evidence two colored morgue photographs for the purpose of establishing the trajectory of the bullet and the distance between the gun and the victim. We cannot accept defendant’s contention that introduction of the photographs constituted prejudicial error.
In People v. Schader, supra, 62 Cal.2d 716, 733, we stated: ,“The -pictures showed a considerable amount of blood and were unpleasant to view, but they did have evidentiary value; the question whether such value outweighed any possible prejudicial effect rested within the sound discretion of the trial court. (People v. Arguello (1964) 61 Cal.2d 210, 213 [37 Cal.Rptr. 601, 390 P.2d 377]; People v. Henderson (1963) 60 Cal.2d 482, 495 [35 Cal.Rptr. 77, 386 P.2d 677].)” Although we are not automatically bound by our prior ruling, since the [781]*781instant trial was not a mere replay of tbe first trial (see People v. Hillery (1967) 65 Cal.2d 795, 803 [56 Cal.Rptr. 280, 423 P.2d 208]), we reach the same conclusion. In evaluating defendant’s contention that the shooting occurred accidentally, the path of the bullet and the distance of the weapon from the victim’s neck, in addition to expert medical testimony, constituted facts of some slight evidentiary value.
6. Alleged errors in instructions
Defendant raises two contentions involving errors in instructions. He argues, first, that the court erred in failing to repeat instructions upon second degree murder and manslaughter when it twice complied with the request of the foreman to repeat instructions on conspiracy and first degree murder. Second, defendant contends that several of the original instructions were erroneous, superfluous and prejudicially repetitive. We find no merit in either point.
We find no error in the court’s repetition of instructions requested by the jury. In each instance, the court read more than one-fourth of all of the original instructions. It instructed the jury fully not only upon those matters which it specifically requested but upon those matters implied from a hypothetical question posed by the foreman and necessary to the jury’s comprehension of the applicable law. Although the court did not repeat its original instructions upon the elements of second degree murder and manslaughter, the jury indicated that it was concerned with the felony-murder theory and not with premeditated murder.
We cannot believe that the repeated instructions either confused the jury or subjected it to pressure from the judge. The court was scrupulously careful to disclaim any intention to learn of the content of the deliberations or to emphasize one instruction over another through repetition. The instructions were properly framed in a neutral manner, rather than with undue emphasis on affirmative constructions such as, “it is your duty to convict if” or, “defendant is guilty if.” We know of no rule which requires the court to repeat all of its original instructions whenever the jury requests additional instructions upon a particular point. Such a procedure would not only be extraordinarily time-consuming and exhausting to the court, the jury, and the parties, but also would deter the jury from requesting, and the court from giving, additional instructions to elucidate a single issue.
Defendant contends that the trial court erred in instructing the jury that it could consider evidence of the [782]*782prior robbery “for such bearing as it might have on the question whether the defendants are innocent or guilty of the crime charged against them in this action.” The context of the instruction shows that the court properly limited the jury’s consideration of the evidence: “Such evidence was received for a limited purpose only: not to prove distinct offenses or continual criminality, but for such bearing, if any, as it might have on the question whether the defendants are innocent or guilty of the crimes charged against them in this action. . . . The value, if any, of such evidence relating to the alleged commission of a robbery other than the robbery charged in the indictment depends on whether or not it tends to show that there existed in the mind of the defendant Harry Schader at the time of the robbery alleged in the indictment a plan, scheme, system or design, or that he entertained the intent which is a necessary element of the crime of robbery. . . .” (Italics added.) The balance of defendant’s argument as to the impropriety of the instruction depends upon the inadmissibility of the evidence of the prior robbery, a contention which we rejected above.
Defendant raises the second contention that the court erred in including within its definition of second degree murder, “Two, when the circumstances attending the killing show' an abandoned or malignant heart.” Several months after the conclusion of the instant trial we explained in some detail why an instruction based upon this hoary mixed metaphor embodied in Penal Code section 188 is “unnecessary and undesirable.” (People v. Phillips (1966) 64 Cal.2d 574, 587 [51 Cal.Rptr. 225, 414 P.2d 353].) While we disapproved its future use, we did not hold that its inclusion in instructions upon second degree murder constituted error. (People v. Phillips, supra, at p. 588.)
Third, defendant argues that the court repeated unnecessarily instructions upon murder of the first degree. We shall not attempt to report or summarize the instructions, but merely note our conclusion that in view of the multiplicity, of theories advanced by the prosecution pertaining to first degree murder, the 'court’s instructions were as succinct as possible. If the court had omitted any of the instructions tendered, defendant might have successfully argued on appeal that the court failed adequately to define the requirements necessary for a conviction of first degree murder.
Finally, we find no merit in defendant’s contention that the court’s instructions called unnecessary attention to the [783]*783fact that the victim was a police officer. The fact appeared but once in the original instructions, although it was included in the portions re-read upon the jury’s request.
7. Other contentions relating to the guilt trial
Defendant raises a number of other contentions which lack merit. We shall deal briefly with each.
(a) Sufficiency of the evidence. Defendant contends that the evidence was insufficient, as a matter of law, to support a conviction of first degree murder. Yet the evidence sufficiently sustained the conviction upon any one of three theories: (i) that defendant killed Officer McKnight deliberately and with premeditation; (ii) that the killing occurred during the robbery in which defendant participated as an accomplice pursuant to a previously agreed-upon plan; and (iii) that defendant became an aider and abettor in the robbery after he became aware of its existence and killed the officer while effectuating his escape.
As to the first theory, eyewitnesses to the struggle between -defendant and the victim testified that for several seconds before he fired the fatal shot defendant had succeeded in gaining the advantage against the officer by moving around behind him as defendant drew his pistol. Defendant testified that he cocked his pistol as he brought it up to the officer’s neck. This, evidence permitted the jury to infer that defendant formed the necessary premeditation during the moments of the struggle. (People v. Quicke (1964) 61 Cal.2d 155, 158 [37 Cal.Rptr. 617, 390 P.2d 393]; People v. Cartier (1960) 54 Cal.2d 300, 305-306 [5 Cal.Rptr. 573, 353 P.2d 53].)
As to the second and third theories, the employees of the market testified that defendant moved to within several feet of the area:of the checkstands at the time codefendant Turner was perpetrating the robbery, and. left a few seconds after Turner fled with the loot. Defendant had participated in' a prior robbery with his uncle in which the uncle’s role was to' “cover” defendant in a manner similar to that of defendant in the instant offense. The jury might properly have inferred from such evidence either that defendant acted simply as an accomplice executing a common plan15 or that he became an aider and abettor when he learned that the robbery was in [784]*784progress. Nothing compelled the jury to believe defendant’s story that he learned of the perpetration of the robbery only after the killing, even in the absence of direct contradictory evidence.
(b) Illegal arrest. Defendant contends that his arrest was illegal, as based upon less than probable canse, and that all evidence obtained subsequent to the arrest should be suppressed as its “poisonous fruit.” We upheld the legality of the arrest in People v. Schader, supra, 62 Cal.2d 716, 722-726, saying, “Under such circumstances as faced this officer, society must risk the arrest of suspects who are innocent rather than subject officers to needless hazards in effecting the arrest of suspected armed murderers.” (Id. at p. 725.) We noted the pei’tinence of the view of Mr. Justice Jackson in his dissenting opinion in Brinegar v. United States (1949) 338 U.S. 160, 183 [93 L.Ed. 1879, 1894, 69 S.Ct. 1302], that .standards of probable cause “should depend somewhat upon the gravity of the offense. ’ ’ Defendant contends that new evidence, adduced for the first time at the instant trial, showed that the arresting officer “arrested on suspicion only,” and permits us to reexamine our earlier holding. (See People v. Hillery, supra, 65 Cal.2d 795, 803.) We do not find, however, that such “new evidence” falls without the rationale of our previous determination, and conclude once again that defendant’s arrest was proper.
(c) Discrimination in selection of fury panel
We cannot accept defendant’s contention that he suffered violation of his Sixth Amendment right to be tried by a jury of his peers in that the members of the jury panel came predominantly from “high social, economic and educational strata of society.” Not only did defendant fail properly to raise the issue by objecting to the composition of the jury panel, but he does not show that the composition of the panel resulted from “intentional, systematic discrimination against persons of defendant’s . . . economic status . . . .” (People v. Carter (1961) 56 Cal.2d 549, 569 [15 Cal.Rptr. 645, 364 P.2d 477].)
8. Error affecting the penalty determination
Defendant raises several contentions relating to the penalty phase. We conclude that the judgment as to penalty must be reversed because of errors of the type condemned in Witherspoon v. Illinois, supra, 391 U.S. 510.
We set forth in the footnote the relevant voir dire of Mrs. [785]*785Dawson.16 We are unable to find that she made it “unmistakably clear (1) that [she] would automatically vote against the imposition of capital punishment without regard to any evidence that might be developed at the trial ... or (2) that [her] attitude toward the death penalty would prevent [her] from making an impartial decision as to the defendant’s guilt.’’ (Witherspoon v. Illinois, supra, 391 U.S. 510, 522-523, fn. 21 [20 L.Ed.2d 776, 784-785, 88 S.Ct. 1770].) Mrs. Dawson merely stated that she was opposed to the death penalty and that her opinions on the death penalty would prejudice her.17
[786]*786We cannot distinguish Mrs. Dawson’s statements from those we held to be an erroneous basis for exclusion in In re Anderson (1968) 69 Cal.2d 613 [73 Cal.Rptr. 21, 447 P.2d 117]. “. . . . [A]t Saterfield’s trial one prospective juror stated, ‘I am opposed to the death penalty,’ and was thereupon excused for cause; at Anderson’s trial one prospective juror in response to the question ‘Do you know of any reason you couldn’t be a fair and impartial juror in this case?’ replied, ‘Yes, sir, I do. I don’t believe in capital punishment’ and was immediately excused for cause. In neither instance had the court made it clear to that particular prospective juror that opposition to the death penalty or conscientious scruples against that penalty would be insufficient by itself to disqualify such a juror from serving. . . .
“Witherspoon held ‘that a sentence of death can not be carried out if the jury that imposed or recommended it was chosen by excluding veniremen for cause simply because they voiced general objections to the death penalty or expressed conscientious or religious scruples against its infliction. ’ ’ ’ (In re Anderson, supra, 69 Cal.2d at pp. 617-618.)
The trial court therefore committed error in excusing Mrs. Dawson, and this error requires reversal. (In re Anderson, supra, 69 Cal.2d 613, 619-620.) Accordingly we need not consider defendant’s allegations of further errors of the type condemned by Witherspoon v. Illinois, supra, 391 U.S. 510.
Defendant urges additional claims of error regarding the penalty phase. Some of his contentions a majority of this court has recently rejected in In re Anderson, supra, 69 Cal.2d 613; others may not arise at the penalty retrial. For guidance of the court, however, we consider defendant’s contention that evidence of his commission of nine other robberies, for which he was never tried, introduced [787]*787at the penalty phase, was inherently 'unfair and prejudicial, in that the offenses were not described with sufficient particularity as to time and plaee, proof of all of their elements was incomplete, and the court failed properly to instruct the jury upon the standard of proof required for its consideration of the other robberies. The court instructed the jipcy as follows: “You are instructed that you may not consider such evidence in respect to any alleged crime or offense in aggravation of the penalty, unless the commission of the offense was proven beyond a reasonable doubt. The defendant is presumed innocent of those crimes. The effect of this presumption is to place upon the State the burden of proving him guilty thereof beyond a reasonable doubt.” The instruction was proper and would have protected defendant against any deficiency in the People’s proof of the other, offenses. (People v. Polk (1965) 63 Cal.2d 443, 451 [47 Cal.Rptr. 1, 406 P.2d 641]; People v. Terry (1964) 61 Cal.2d 137, 149, fn. 8 [37 Cal.Rptr. 605, 390 P.2d 381].)
Defendant also contends that the evidence of six of the nine prior robberies' should have been excluded because it was obtained as the fruit of an improper interrogation preceding defendant’s 1957 robbery conviction. The record before us fails to support this contention, and since defendant failed to object to the admission of the evidence at trial he may not now urge its inadmissibility.
The judgment imposing the death penalty is reversed insofar as it relates to the penalty. In all other, respects the judgment is affirmed.
Traynor, C. J., Peters, J., and Sullivan, J., concurred.