OPINION
McDERMOTT, Justice
A jury found the appellant, William Wallace, Jr., guilty of murder in the first degree,1 murder in the second degree,2 robbery,3 and criminal conspiracy to commit robbery and criminal homicide.4 After further deliberation, that same jury rendered a verdict of death for the first degree murder conviction.5 Post trial motions were denied and the judgment of sentence was entered on April 14,1987. A consecu[303]*303tive sentence of life was imposed on the appellant for the second degree murder conviction. A concurrent sentence of five to ten years was entered on the conspiracy conviction. The robbery conviction was merged with the the second degree murder conviction and no sentence was imposed on that conviction. Appellant directly appeals the judgment of sentence.6
The events giving rise to this action began on August 17, 1979, when at approximately 5:20 P.M., two men holding handguns, were observed running from Carl’s Cleaners in Cannonsburg, Washington County, Pennsylvania. Moments later, Carl Luisi, Sr., the owner of Carl’s Cleaners, and Tina Spalla, a fifteen (15) year old employee of Mr. Luisi, were found lying on the floor of the store. Both had been shot. Carl Luisi, Sr., had been shot twice, once in the stomach and once in the back. Tina Spalla, was shot once, through the heart. Both died, for a sum of $227.05 stolen that day.
An anonymous phone call was received by the Cannons-burg Police Department which provided a licence plate number and description of a vehicle seen leaving the crime. Several other witnesses gave statements confirming the presence of the same vehicle in the area. Based upon that information, the Cannonsburg Police Department issued a bulletin to other police departments to look for the vehicle. On August 20, 1979, members of the Wheeling, West Virginia, Police Department, located the vehicle in question and following a stake out, arrested the appellant. A second individual later identified as Henry Brown, the owner of the vehicle, was observed but eluded the police. Brown was subsequently arrested and eventually plead guilty to charges stemming from the robbery-murder.
This appeal represents appellant’s third jury trial on the charges of first and second degree murder, robbery, and criminal conspiracy stemming from the robbery and murders. The first trial resulted in a mistrial due to the jury’s inability to reach a verdict. The second trial resulted in the [304]*304jury convicting the appellant of murder in the first degree for the death of Tina Spalla, murder in the second degree for the death of Carl Luisi, Sr., robbery and criminal conspiracy. The jury sentenced the appellant to death for the first degree murder conviction. Subsequently we reversed that jury’s verdict and ordered a new trial. Commonwealth v. Wallace, 500 Pa. 270, 455 A.2d 1187 (1983). In the third trial, as noted above, the jury reached the same verdict reached by the jury in the second trial.
Before addressing the specific issues raised by the appellant, an independent review of the record7 reveals that there is overwhelming evidence which if accepted by the jury, would establish with almost virtual certainty that the appellant not only participated in the robbery and killed Carl Luisi, Sr., but also that he intentionally killed fifteen (15) year old Tina Spalla to cover up his killing of Mr. Luisi and the robbery. At trial, five witnesses testified that they saw an automobile matching Brown’s in the Cannonsburg area during the day in question, at the time of the robbery. Four of them later identified Brown’s car as the one they saw that day, from a number of cars parked at the Washington State Police Barracks. Also, three gave descriptions of the two occupants of the car they saw which matched the general characteristics of the appellant and Brown. Two other witnesses testified that they had observed two individuals having the same general characteristics as the appellant and Brown, running from Carl’s Cleaners right before the killings were discovered. Further, these witnesses testified that the individual matching the appellant, was wearing a tan knee-length trench coat, similar to the one owned [305]*305by the appellant.8 One of these witnesses also testified the individuals he saw running from the cleaners were carrying handguns.
Anita Johnson, the girlfriend of Brown, testified that Brown owned a .38 caliber handgun and the appellant owned a .32 caliber handgun. Further she testified that she was with both Brown and the appellant on the morning of August 17, 1979, and that at that time, they had their guns with them and that the appellant was wearing his trench-coat. She also testified that the two left together that day in Brown’s car and that she did not see either until Brown returned on the evening of August 20, 1979.
Ms. Johnson’s testimony was significant because it was established through earlier testimony that both victims died as a result of being shot with a .32 caliber gun and the description of dress of the appellant on the day of the murders. Dr. Ernst L. Abernathy, the pathologist who performed the autopsies of the victims, testified that on August 18, 1979, he removed two bullet slugs from the body of Mr. Luisi and one from the body of Ms. Spalla and that he turned them over to Trooper Bivens, of the Pennsylvania State Police. Trooper Bivens testified he was present when the autopsies were performed and that when the bullet slugs were removed, they were turned over to him and that he took them to the Greensburg State Police (Crime) Laboratory.9 Trooper Daryl Mayfield of the Greensburg State Police (Crime) Laboratory, who was admitted as an expert in ballistics, testified that he received three bullet slugs from Trooper Bivens and after examining each, determined all three to be .32 caliber bullet slugs and further that all three were fired from the same gun. Furthermore a .38 caliber handgun was introduced into evidence, and identified by Ms. Johnson as Brown’s.
[306]*306Any doubts the jury may have had as to the guilt of the appellant were, if believed, removed by the testimony of the last two Commonwealth witnesses, Brown and Olen Clay Gorby. Brown testified that around 1:00 P.M. on August 17, 1979, he and the appellant left Wheeling, West Virginia, in his car and headed towards Pittsburgh. He testified that on the way they spotted an exit for Cannonsburg and took it so they could “make a couple extra dollars.” He testified he had a .38 caliber handgun and the appellant had a .32 caliber handgun and that the appellant was wearing a beige trenchcoat. He then testified that once inside Cannons-burg, they spotted a cleaners and after circling it and seeing only one girl working, they decided to park and go in. He testified that upon entering they asked for a price list and when the girl bent down they pulled out their guns. He stated further that the appellant went into the back to make sure no one else was there. He testified that while he was emptying the cash register he heard a gun shot and when he looked back, he saw an old man holding his stomach and then saw the appellant shoot him in the back, “before he could hit the ground.” N.T., Third Trial, p. 613.
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OPINION
McDERMOTT, Justice
A jury found the appellant, William Wallace, Jr., guilty of murder in the first degree,1 murder in the second degree,2 robbery,3 and criminal conspiracy to commit robbery and criminal homicide.4 After further deliberation, that same jury rendered a verdict of death for the first degree murder conviction.5 Post trial motions were denied and the judgment of sentence was entered on April 14,1987. A consecu[303]*303tive sentence of life was imposed on the appellant for the second degree murder conviction. A concurrent sentence of five to ten years was entered on the conspiracy conviction. The robbery conviction was merged with the the second degree murder conviction and no sentence was imposed on that conviction. Appellant directly appeals the judgment of sentence.6
The events giving rise to this action began on August 17, 1979, when at approximately 5:20 P.M., two men holding handguns, were observed running from Carl’s Cleaners in Cannonsburg, Washington County, Pennsylvania. Moments later, Carl Luisi, Sr., the owner of Carl’s Cleaners, and Tina Spalla, a fifteen (15) year old employee of Mr. Luisi, were found lying on the floor of the store. Both had been shot. Carl Luisi, Sr., had been shot twice, once in the stomach and once in the back. Tina Spalla, was shot once, through the heart. Both died, for a sum of $227.05 stolen that day.
An anonymous phone call was received by the Cannons-burg Police Department which provided a licence plate number and description of a vehicle seen leaving the crime. Several other witnesses gave statements confirming the presence of the same vehicle in the area. Based upon that information, the Cannonsburg Police Department issued a bulletin to other police departments to look for the vehicle. On August 20, 1979, members of the Wheeling, West Virginia, Police Department, located the vehicle in question and following a stake out, arrested the appellant. A second individual later identified as Henry Brown, the owner of the vehicle, was observed but eluded the police. Brown was subsequently arrested and eventually plead guilty to charges stemming from the robbery-murder.
This appeal represents appellant’s third jury trial on the charges of first and second degree murder, robbery, and criminal conspiracy stemming from the robbery and murders. The first trial resulted in a mistrial due to the jury’s inability to reach a verdict. The second trial resulted in the [304]*304jury convicting the appellant of murder in the first degree for the death of Tina Spalla, murder in the second degree for the death of Carl Luisi, Sr., robbery and criminal conspiracy. The jury sentenced the appellant to death for the first degree murder conviction. Subsequently we reversed that jury’s verdict and ordered a new trial. Commonwealth v. Wallace, 500 Pa. 270, 455 A.2d 1187 (1983). In the third trial, as noted above, the jury reached the same verdict reached by the jury in the second trial.
Before addressing the specific issues raised by the appellant, an independent review of the record7 reveals that there is overwhelming evidence which if accepted by the jury, would establish with almost virtual certainty that the appellant not only participated in the robbery and killed Carl Luisi, Sr., but also that he intentionally killed fifteen (15) year old Tina Spalla to cover up his killing of Mr. Luisi and the robbery. At trial, five witnesses testified that they saw an automobile matching Brown’s in the Cannonsburg area during the day in question, at the time of the robbery. Four of them later identified Brown’s car as the one they saw that day, from a number of cars parked at the Washington State Police Barracks. Also, three gave descriptions of the two occupants of the car they saw which matched the general characteristics of the appellant and Brown. Two other witnesses testified that they had observed two individuals having the same general characteristics as the appellant and Brown, running from Carl’s Cleaners right before the killings were discovered. Further, these witnesses testified that the individual matching the appellant, was wearing a tan knee-length trench coat, similar to the one owned [305]*305by the appellant.8 One of these witnesses also testified the individuals he saw running from the cleaners were carrying handguns.
Anita Johnson, the girlfriend of Brown, testified that Brown owned a .38 caliber handgun and the appellant owned a .32 caliber handgun. Further she testified that she was with both Brown and the appellant on the morning of August 17, 1979, and that at that time, they had their guns with them and that the appellant was wearing his trench-coat. She also testified that the two left together that day in Brown’s car and that she did not see either until Brown returned on the evening of August 20, 1979.
Ms. Johnson’s testimony was significant because it was established through earlier testimony that both victims died as a result of being shot with a .32 caliber gun and the description of dress of the appellant on the day of the murders. Dr. Ernst L. Abernathy, the pathologist who performed the autopsies of the victims, testified that on August 18, 1979, he removed two bullet slugs from the body of Mr. Luisi and one from the body of Ms. Spalla and that he turned them over to Trooper Bivens, of the Pennsylvania State Police. Trooper Bivens testified he was present when the autopsies were performed and that when the bullet slugs were removed, they were turned over to him and that he took them to the Greensburg State Police (Crime) Laboratory.9 Trooper Daryl Mayfield of the Greensburg State Police (Crime) Laboratory, who was admitted as an expert in ballistics, testified that he received three bullet slugs from Trooper Bivens and after examining each, determined all three to be .32 caliber bullet slugs and further that all three were fired from the same gun. Furthermore a .38 caliber handgun was introduced into evidence, and identified by Ms. Johnson as Brown’s.
[306]*306Any doubts the jury may have had as to the guilt of the appellant were, if believed, removed by the testimony of the last two Commonwealth witnesses, Brown and Olen Clay Gorby. Brown testified that around 1:00 P.M. on August 17, 1979, he and the appellant left Wheeling, West Virginia, in his car and headed towards Pittsburgh. He testified that on the way they spotted an exit for Cannonsburg and took it so they could “make a couple extra dollars.” He testified he had a .38 caliber handgun and the appellant had a .32 caliber handgun and that the appellant was wearing a beige trenchcoat. He then testified that once inside Cannons-burg, they spotted a cleaners and after circling it and seeing only one girl working, they decided to park and go in. He testified that upon entering they asked for a price list and when the girl bent down they pulled out their guns. He stated further that the appellant went into the back to make sure no one else was there. He testified that while he was emptying the cash register he heard a gun shot and when he looked back, he saw an old man holding his stomach and then saw the appellant shoot him in the back, “before he could hit the ground.” N.T., Third Trial, p. 613. He said that the appellant then came back, asked him to shot the girl and that he refused. He then testified, referring to the appellant, “at that point he didn’t hesitate, he just shot — ” N.T., Third Trial, p. 614. He testified they then left the cleaners, Brown first and the appellant following, and that they still had their guns out about half way down the street before they put them away.
Olen Clay Gorby testified that he was incarcerated with the appellant in the Washington County Jail during the summer of 1980 and that at that time, he had known the appellant for approximately seven years. He stated that during a conversation he had with the appellant while both were incarcerated, the appellant admitted that he robbed Carl’s Cleaners and that he shot Mr. Luisi.10 Further, [307]*307Gorby testified that the appellant said he told Brown to shoot Ms. Spalla and when Brown refused, he did.
The evidence presented if believed, sufficiently established the appellant’s guilt and in fact, left no room for doubt, with the credibilities accepted by the jury, the evidence is overwhelming. With this in mind we address the appellant’s specific claims of error.
The first claim of error is the trial court erred in denying his motion for a mistrial based upon a commonwealth witness’ testimony which raised an inference of the appellant’s past criminal record. At trial the prosecution asked Olen Gorby, “where did you meet the defendant Wallace” and Gorby replied, “I met him in the West Virginia Penitentiary, 1973.” N.T., Third Trial, p. 722-23. The defense objected and moved for a mistrial.11 The appellant’s motion was denied and appellant refused an offer by the trial judge to give a cautionary instruction claiming that an instruction would only serve to further prejudice him. N.T., Third Trial, p. 738-749.12
Appellant claims that the testimony was highly prejudicial because it created an inference of unrelated past criminal acts and because it was highlighted by an overnight recess directly after introduction. The prosecution argues that it was merely attempting to demonstrate that there was a relationship between the witness and the appellant, to establish that the appellant would confide in the witness. Further the prosecution argues that the statement did not relate to a specific past criminal act and that at the time of the statement, approximately 90% of the commonwealth’s evidence had been presented. The trial judge ruled that the creation of the inference was uninten[308]*308tional on the part of the prosecution and that it did not exploit the statement. N.T., Third Trial, p. 736.
In Commonwealth v. Morris, 513 Pa. 169, 519 A.2d 374 (1986), we addressed a similar situation where there was an improper reference to prior criminal activity at trial. In Morris we held:
As a general rule, evidence of crimes unrelated to the charge for which the defendant is being tried, is inadmissible.....There is no per se rule that requires a new trial for a defendant every time there is a reference to prior criminal activity.....“We have never ascribed to the view that all improper reference to prior criminal activities necessarily require the award of a new trial as the only effective remedy.” ____Further the reference to the prior criminal activity must be prejudicial to the defendant, with prejudice resulting “where the testimony conveys to the jury, either expressly or by reasonable implication, the fact of a prior criminal offense.”
However it is possible to eradicate any possible prejudice resulting from reference to prior criminal activity by the defendant____ An immediate curative instruction to the jury may alleviate any harm to the defendant that results from reference to prior criminal conduct.
Id., 513 Pa. at 175-76, 519 A.2d at 376-77. (Citations omitted).
This is not a situation involving an exception to the general rule nor is there any doubt that the testimony created an inference to the jury that the appellant had been involved in prior criminal activity. However we do not believe that a new trial is warranted under the circumstances present here. As we said in Morris, there is no per se rule that requires a new trial for a defendant every time there is a reference to prior criminal activity. In this case, the testimony did not relate to any specific past criminal act and while the testimony might have inferentially exposed a prior conviction, the jury had no direct knowledge of the basis of that conviction. In light of the overwhelming and uncontroverted evidence presented establishing appellant’s [309]*309guilt, the improper reference to the appellant’s prior incarceration was harmless at most.13
The appellant asserts in the alternative, that the trial judge erred in not giving a cautionary instruction. The record reveals that the trial court offered to give a cautionary instruction and that counsel for the appellant failed to take a stand on whether or not one should be given. Further the record reveals that no objection was made when a cautionary instruction was not forthcoming. This argument has been waived. See Commonwealth v. Pierce, 515 Pa. 153, 527 A.2d 973 (1987); Commonwealth ex rel. Washington v. Maroney, 427 Pa. 599, 644, 235 A.2d 349, 352 (1969).14
The second claim of trial error is that the trial court improperly excluded a six page signed statement made by Anita Johnson to police.15 The appellant asserts that the statement was admissible as impeachment evidence against Ms. Johnson or Brown thus, as substantive evidence of the appellant’s innocence. In the statement Ms. Johnson alleged that on the Sunday night that Brown returned to her apartment, Brown told her he shot Ms. Spalla. Ms. Johnson’s statement was made to police on August 23, 1979, six [310]*310days after the murders and three days after the alleged conversation. The trial judge had excluded the statement under the hearsay rule holding that no inconsistencies existed between Ms. Johnson’s trial testimony and the statement she made to police, thus the prior statement was inadmissible as impeachment evidence.
In addition to the summarized testimony referred to above, Ms. Johnson testified that she first heard about the robbery and murders on Monday morning, however when cross-examined about what Brown had told her, she changed her testimony by stating that on the night of August 20, 1979, when Brown returned to her apartment, he was handling his gun in front of her and that he mentioned “something about something.” N.T., Third Trial, p. 573-74. The appellant claims that Ms. Johnson’s trial testimony is inconsistent with the statement she made to police and the statement was admissible as impeachment evidence. We need not address the underlying issue of whether Ms. Johnson’s statement was admissible for we find that its exclusion was harmless error at best.
Johnson’s testimony was a recitation of what she knew of her own knowledge and observation. What she offered was circumstantial evidence. Her testimony was not a direct inculpation of the appellant. In reviewing the evidence it is necessary to keep in mind that at this trial the only defendant was this appellant. What Brown told Johnson was therefore hearsay evidence as against this appellant and therefore not admissible by whoever would offer it. Certainly what Brown told her could not be used to inculpate the appellant and nothing that Brown told her was told to the jury. Were the statement allowed it not only would have inculpated Wallace and Brown in this murder and robbery but was fraught with other crimes that would not be admissible against the appellant. Hence her testimony was carefully restricted circumstantial evidence, and not the direct inculpation contained in Brown’s alleged statement to her. The statement takes a different turn, however, where the uses are to impeach the testimony of Brown. Brown [311]*311did directly inculpate himself and Wallace at trial. He said Wallace shot both victims. He of course could be asked if he said something different before and he was. In answer he said both yes and no, finally denying that he ever said to Johnson that he shot the girl.
When asked on direct examination whether he told Johnson he shot the girl Brown said, “I may have but I don’t remember saying it.” N.T., Third Trial, p. 621. On cross examination he both admitted and denied that he told Johnson he shot the girl. The appellant’s attorney asked Brown, “You told [her] that you shot the little girl?” and he replied:
Yes. No, wait a minute, I did say something to her to that effect, but I didn’t — I don’t remember exactly whether I did or not.
N.T., Third Trial, p. 703. In addition, Brown was questioned by appellant’s attorney about Ms. Johnson’s running around bragging about how he shot Ms. Spalla and Wallace shot Mr. Luisi, but Brown still maintained that it was Wallace who committed the murders. See N.T., Third Trial, p. 705-06. Thus the issue before the jury was his credibility, in view of his earlier admission and later denial both affirming that he told Johnson he did, and denying it.
The third claim of error is that the bullet slugs removed from the victims were improperly admitted because there was a question of their authenticity and there was no testimony as to the chain of custody. He alleges that this was prejudicial because there was a question as to whether one of the victims, Tina Spalla, died as the result of a .38 or .32 caliber bullet wound. However the record reveals that after a proper foundation had been established, Trooper Mayfield of the Greensburg State Police (Crime) Laboratory testified that all three bullet slugs removed from the victims were fired from the same .32 caliber handgun. Therefore the admission of the bullets was not error. The bullet slugs had been in the custody of the court since the first trial in 1981 when a proper foundation had been laid. Thus their custody was authenticated.
[312]*312The fourth claim of error is that the trial court erred in allowing the testimony of Brown. The appellant asserts that Brown’s testimony was coerced by the prosecution, thus his right to due process, under the fifth and fourteenth amendments to the United States Constitution, were violated. Specifically he claims that Brown’s testimony was obtained in violation of Rules 321, 1410 and, 1501 thru 1507, of the Pennsylvania Rules of Criminal Procedure, which govern guilty pleas, sentencing and post-conviction relief under the Post Conviction Hearing Act (P.C.H.A.).16 The appellant does not allege that the witness lied. The record reveals that every aspect of the bargain between Brown and the prosecution was presented to the jury in painstaking detail and that nothing was hidden from their scrutiny. Thus the admission of Brown’s testimony was harmless. Further the appellant lacks standing to challenge the guilty plea or plea bargain. See Commonwealth v. Howard, 358 Pa.Super. 259, 517 A.2d 192 (1986).
The fifth claim of error is that the trial judge erred in refusing appellant’s request for a non-jury trial. The appellant asserts that he had an absolute right to a non-jury trial regardless of motivation. We disagree. The appellant has the constitutional right of trial by jury and he has a legal right to waive a jury trial and have the case decided by a judge. Commonwealth v. Wharton, 495 Pa. 581, 435 A.2d 158 (1981); Commonwealth v. Sorrell, 500 Pa. 355, 456 A.2d 1326 (1982); Adams v. United States ex rel. McCann, 317 U.S. 269, 278-280, 63 S.Ct. 236, 241-242, 87 L.Ed. 268 (1942). In addition, the decision is that of the defendant and not his attorney. See Commonwealth v. Brown, 329 Pa.Super. 85, 477 A.2d 1364, 1368 (1984). However the right is not absolute and it does not include the right to judge-shop. Commonwealth v. Garrison, 242 Pa. Super. 509, 514-15, 364 A.2d 388, 390-91 (1976) (jury trial waiver properly denied where record indicates “judge shop[313]*313ping”); Sorrell, 500 Pa. at 362, 456 A.2d at 1329 (Having determined that exposure to the accused’s criminal record would potentially taint court’s impartiality as a fact finder, the court properly denied request for non-jury trial); Municipal Publications, Inc. v. Court of Common Pleas of Philadelphia County, 507 Pa. 194, 202, 489 A.2d 1286, 1289 (1985) (Judge shopping has been universally condemned and will not be tolerated). The trial judge denied the appellant’s motion finding that the appellant was merely attempting to have the judge recuse himself and that he was not truly waiving his right to trial by jury. These findings are supported by the record and the trial judge properly denied appellant’s motion.17
The sixth claim of error is that the trial judge erred in denying appellant’s request to call two witnesses to testify on his behalf, specifically Jon Stevens and the trial judge himself. The appellant sought to introduce Stevens’ testimony to bolster another witness’ trial testimony. The trial judge ruled the testimony was irrelevant because the other witness’ credibility was never challenged.18 The trial judge’s ruling is supported by the record. Therefore we find no abuse of discretion.
The trial judge also held that his testimony was irrelevant. The appellant asserts that the judge’s testimony [314]*314was relevant to show that the prior guilty plea of Brown was valid and thereby attack the credibility of Brown. The trial judge denied the motion because the arrangement between the prosecution and Brown had already been fully explained to the jury. This ruling is supported by the record and we find no abuse of discretion.19
The seventh claim of error is that the trial judge misled the the jury in closing remarks by highlighting the defense witnesses’ past criminal records and by failing to give the same attention to prosecution witnesses, thus prejudicing him and denying him a fair trial. Appellant concedes that the jury was aware of the witnesses’ criminal records but argues that the judge’s bias in his remarks served to prejudice his case. The trial judge emphasized the convictions of the defense witnesses as the appellant complains. N.T., Third Trial, p. 952. However the record reflects that the trial judge properly charged the jury on the unreliability of Brown’s testimony and in fact went further than necessary by stating that the jury should view Brown’s testimony as coming from a corrupt and polluted source and that they should accept it only with care and caution. N.T., Third Trial, pp. 952-953. In addition the record does not reflect nor does the appellant assert, that he requested any special charge with regard to this issue.
The eighth claim of error is that evidence was insufficient and thus the trial court erred in denying his demurrer to the evidence. In support of this claim the appellant asserts [315]*315that the only direct evidence of guilt was Brown’s testimony and that it should not have been admitted and that the other evidence was insufficient to sustain his conviction. We have previously addressed the appellant’s claim that Brown’s testimony was improperly admitted and concluded it to be without merit. Furthermore we have addressed whether the evidence was sufficient and have found that it was.
In addition to the above, neither of the issues raised by the appellant’s assertion of trial error, are appeal-able. The trial court’s denial of appellant’s demurrer to the evidence is not appealable since he presented a case in defense. See Commonwealth v. Sourbeer, 492 Pa. 17, 422 A.2d 116 (1980); Commonwealth v. Ilgenfritz, 466 Pa. 345, 353 A.2d 387 (1976). A challenge to the weight of the evidence is not appealable. See Commonwealth v. Nelson, 514 Pa. 262, 271, n. 3, 523 A.2d 728, 733, n. 3 (1987). Moreover, circumstantial evidence is sufficient to sustain a conviction “so long as the combination of evidence links the accused to the crime beyond a reasonable doubt.” Commonwealth v. Hardcastle, 519 Pa. 236, 246, 546 A.2d 1101, 1105 (1988) (citations omitted); Commonwealth v. Holcomb, 508 Pa. 425, 447, 498 A.2d 833, 844 (1985) (... the cumulative effect of all the circumstantial evidence together with the reasonable inferences and conclusions logically flowing from that evidence is enough to support the guilty verdict.). Regardless of the admission of Brown’s testimony we believe that the other evidence presented at trial sufficiently linked the appellant to the robbery and murders, beyond a reasonable doubt. A death sentence can be imposed in cases where a conviction for murder of the first degree rests upon circumstantial evidence. See Commonwealth v. Yarris, 519 Pa. 571, 603-604, 549 A.2d 513, 529 (1988); 42 Pa.C.S., § 9711(e).
Lastly, in all cases in which the death penalty has been imposed, we are obligated by statute to review the record and to assure that the death sentence: is not the product of passion, prejudice or any other arbitrary [316]*316factor;20 is supported by a finding of aggravating circumstances specified in subsection (d);21 and is not excessive or disproportionate to the penalty imposed in similar cases____22 Further pursuant to Commonwealth v. Frey, 504 Pa. 428, 443, 475 A.2d 700, 707-08 (1984), cert. denied 469 U.S. 963, 105 S.Ct. 360, 83 L.Ed.2d 296 (1984), we are obligated to review data and information pertaining to similar cases, compiled by the Administrative Office of the Pennsylvania Courts (AOPC).
The jury had found one aggravating circumstance and no mitigating circumstances. Specifically the jury found that the appellant murdered Ms. Spalla while committing a felony. This is supported by the record and is within the statute. 42 Pa.C.S., § 9711(d)(6). Further the appellant refused to present any evidence of mitigation. N.T., Third Trial, p. 993. Under these circumstances, the statute requires a sentence of death, thus the sentence cannot be considered excessive or the product of passion. 42 Pa.C.S., § 9711(c)(1)(iv); Commonwealth v. Blystone, 519 Pa. 450, 474, 549 A.2d 81, 93 (1988). Furthermore we have reviewed an AOPC study and the appellant’s sentence is not disproportionate to the sentence imposed on others similarly situated.
Based upon the forgoing reasons, we sustain the convictions and affirm the sentences.
ZAPPALA, J., files a dissenting opinion in which NIX, C.J., joins.
STOUT, Former Justice, did not participate in the decision of this case.
This case was reassigned to this writer.