SHIRLEY S. ABRAHAMSON, J.
This is a review of an unpublished decision of the court of appeals filed December 14,1989. The court of appeals reversed a [91]*91judgment of conviction of aggravated battery while armed with a dangerous weapon in violation of secs. 940.19(2) and 939.63, Stats. 1987-88, entered by the Circuit Court for Rock County, Edwin C. Dahlberg, Circuit Judge, and remanded the cause for a new trial.
The issue is whether the circuit court abused its discretion when it ruled as a matter of law that the defendant charged with assault could not present evidence, other them his own testimony, of the victim's prior violent acts of which the defendant was aware. This evidence was proffered to support the defendant's claim of self-defense, that is, to prove the defendant's state of mind: the reasonableness of the defendant's fear of the victim and of the defendant's use of force against the victim. We conclude, as did the court of appeals, that the circuit court abused its discretion when it erroneously concluded that the law restricts the defendant's proof of the victim's prior violent conduct to the defendant's own testimony. We also conclude, as did the court of appeals, that the error was not harmless. Accordingly we affirm the decision of the court of appeals.
For purposes of this review the facts are not in dispute. The defendant, the victim, and two other men were involved in an altercation in which the defendant shot the victim with the victim's gun. While the four men gave somewhat different accounts of the shooting, the undisputed facts are that the four men spent the evening of the shooting visiting friends and drinking. The victim and one of the men (not the defendant) got into an argument. The defendant attempted to intercede, apparently was threatened by the victim, and shot the victim.
The defendant was charged with attempted first-degree murder and aggravated battery while armed with a dangerous weapon. The defendant admitted at trial [92]*92that he shot the victim but claimed privileged self-defense. The jury found the defendant not guilty of attempted first-degree murder but found him guilty of aggravated battery while armed with a dangerous weapon.
To support his claim of self-defense the defendant attempted to show at trial that at the time of the shooting he reasonably believed that the victim was about to assault him and that his use of force was necessary to prevent or terminate a violent assault by the victim.1 Thus the only issue at trial was the defendant's state of mind.
The defendant sought to prove his state of mind (1) by testifying in his own behalf about six incidents of which he was aware prior to the shooting in which the victim demonstrated his proclivity for violence,2 (2) by questioning defense witness Tom Ewing at trial about the victim's reputation for being a violent person, (3) by cross-examining the victim about these incidents to show that the defendant knew about the incidents and [93]*93that his fear of the victim was reasonable, and (4) by questioning Ewing about two of these incidents (in which Ewing had been personally involved) to show that the defendant knew about these incidents and that his fear of the victim was reasonable.
The circuit court admitted the defendant's testimony and Ewing's opinion about reputation (the first and second items of evidence described above) but excluded the testimony of the victim and Ewing about the six incidents (the third and fourth items of evidence described above).
Relying on McMorris v. State, 58 Wis. 2d 144, 205 N.W.2d 559 (1973), and McAllister v. State, 74 Wis. 2d 246, 250-51, 246 N.W.2d 511 (1976), the state and the defendant agree that all the evidence the defendant sought to introduce, including the testimony of the victim and witness Ewing that the circuit court excluded, is admissible within the circuit court's discretion. The parties disagree only about whether the circuit court abused its discretion in this case in excluding the evidence.3 We summarize the rules set forth in McMorris and McAllister.
[94]*94First, McMorris allows an accused in a prosecution for assault or homicide to support a self-defense claim by proving prior specific instances of the victim's violence of which the accused was aware at the time of the assault to establish the accused's state of mind about the danger the victim posed. "The admission of such evidence rests in the exercise of sound and reasonable discretion by the trial court." McMorris, 58 Wis. 2d at 152. We went on to say,
When the accused maintains self-defense, he should be permitted to show he knew of specific prior instances of violence on the part of the victim. It enlightens the jury on the state of his mind at the time of the affray, and thereby assists them in deciding whether he acted as a reasonably prudent person would under similar beliefs and circumstances.
When the issue of self-defense is raised in a prosecution for assault or homicide and there is a factual basis to support such defense, the defendant may, in support of the defense, establish what the defendant believed to be the turbulent and violent character of the victim by proving prior specific instances of violence within his knowledge at the time of the incident.4
[95]*95The past violent conduct of the victim of which the accused is aware, reasoned the court in McMorris, 58 Wis. 2d at 151, affects what the accused might reasonably expect of the victim in the future.
Second, according to McMorris, an accused's proof of the victim's prior violent acts of which the accused was aware is not limited to the accused's own testimony. In McAllister, 74 Wis. 2d at 250-51, we stated that the accused should be allowed, within the discretion of the circuit court, to produce supporting evidence to prove the particular acts of which the accused claims knowledge, thereby proving the reasonableness of the accused's knowledge and apprehension of the victim and the credibility of his assertions about his state of mind. The court recognized that the self-serving nature of an accused's testimony about prior violent acts of the victim makes corroborating evidence of those acts particularly important for an accused's claim of self-defense. We stated:
A defendant should not be limited merely to his own assertion that he had knowledge of particular violent acts, but should be allowed to produce supporting evidence to prove the reality of the particular acts of which he claims knowledge, thereby proving reasonableness of his knowledge and apprehension and the [96]*96credibility of his assertion.5
Third, according to McMorris, 58 Wis. 2d at 152, and McAllister, 74 Wis. 2d at 251, the admission of evidence of prior specific instances of the victim’s violence, whether by the testimony of the defendant or other witnesses, rests in the exercise of sound and reasonable discretion of the circuit court.
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SHIRLEY S. ABRAHAMSON, J.
This is a review of an unpublished decision of the court of appeals filed December 14,1989. The court of appeals reversed a [91]*91judgment of conviction of aggravated battery while armed with a dangerous weapon in violation of secs. 940.19(2) and 939.63, Stats. 1987-88, entered by the Circuit Court for Rock County, Edwin C. Dahlberg, Circuit Judge, and remanded the cause for a new trial.
The issue is whether the circuit court abused its discretion when it ruled as a matter of law that the defendant charged with assault could not present evidence, other them his own testimony, of the victim's prior violent acts of which the defendant was aware. This evidence was proffered to support the defendant's claim of self-defense, that is, to prove the defendant's state of mind: the reasonableness of the defendant's fear of the victim and of the defendant's use of force against the victim. We conclude, as did the court of appeals, that the circuit court abused its discretion when it erroneously concluded that the law restricts the defendant's proof of the victim's prior violent conduct to the defendant's own testimony. We also conclude, as did the court of appeals, that the error was not harmless. Accordingly we affirm the decision of the court of appeals.
For purposes of this review the facts are not in dispute. The defendant, the victim, and two other men were involved in an altercation in which the defendant shot the victim with the victim's gun. While the four men gave somewhat different accounts of the shooting, the undisputed facts are that the four men spent the evening of the shooting visiting friends and drinking. The victim and one of the men (not the defendant) got into an argument. The defendant attempted to intercede, apparently was threatened by the victim, and shot the victim.
The defendant was charged with attempted first-degree murder and aggravated battery while armed with a dangerous weapon. The defendant admitted at trial [92]*92that he shot the victim but claimed privileged self-defense. The jury found the defendant not guilty of attempted first-degree murder but found him guilty of aggravated battery while armed with a dangerous weapon.
To support his claim of self-defense the defendant attempted to show at trial that at the time of the shooting he reasonably believed that the victim was about to assault him and that his use of force was necessary to prevent or terminate a violent assault by the victim.1 Thus the only issue at trial was the defendant's state of mind.
The defendant sought to prove his state of mind (1) by testifying in his own behalf about six incidents of which he was aware prior to the shooting in which the victim demonstrated his proclivity for violence,2 (2) by questioning defense witness Tom Ewing at trial about the victim's reputation for being a violent person, (3) by cross-examining the victim about these incidents to show that the defendant knew about the incidents and [93]*93that his fear of the victim was reasonable, and (4) by questioning Ewing about two of these incidents (in which Ewing had been personally involved) to show that the defendant knew about these incidents and that his fear of the victim was reasonable.
The circuit court admitted the defendant's testimony and Ewing's opinion about reputation (the first and second items of evidence described above) but excluded the testimony of the victim and Ewing about the six incidents (the third and fourth items of evidence described above).
Relying on McMorris v. State, 58 Wis. 2d 144, 205 N.W.2d 559 (1973), and McAllister v. State, 74 Wis. 2d 246, 250-51, 246 N.W.2d 511 (1976), the state and the defendant agree that all the evidence the defendant sought to introduce, including the testimony of the victim and witness Ewing that the circuit court excluded, is admissible within the circuit court's discretion. The parties disagree only about whether the circuit court abused its discretion in this case in excluding the evidence.3 We summarize the rules set forth in McMorris and McAllister.
[94]*94First, McMorris allows an accused in a prosecution for assault or homicide to support a self-defense claim by proving prior specific instances of the victim's violence of which the accused was aware at the time of the assault to establish the accused's state of mind about the danger the victim posed. "The admission of such evidence rests in the exercise of sound and reasonable discretion by the trial court." McMorris, 58 Wis. 2d at 152. We went on to say,
When the accused maintains self-defense, he should be permitted to show he knew of specific prior instances of violence on the part of the victim. It enlightens the jury on the state of his mind at the time of the affray, and thereby assists them in deciding whether he acted as a reasonably prudent person would under similar beliefs and circumstances.
When the issue of self-defense is raised in a prosecution for assault or homicide and there is a factual basis to support such defense, the defendant may, in support of the defense, establish what the defendant believed to be the turbulent and violent character of the victim by proving prior specific instances of violence within his knowledge at the time of the incident.4
[95]*95The past violent conduct of the victim of which the accused is aware, reasoned the court in McMorris, 58 Wis. 2d at 151, affects what the accused might reasonably expect of the victim in the future.
Second, according to McMorris, an accused's proof of the victim's prior violent acts of which the accused was aware is not limited to the accused's own testimony. In McAllister, 74 Wis. 2d at 250-51, we stated that the accused should be allowed, within the discretion of the circuit court, to produce supporting evidence to prove the particular acts of which the accused claims knowledge, thereby proving the reasonableness of the accused's knowledge and apprehension of the victim and the credibility of his assertions about his state of mind. The court recognized that the self-serving nature of an accused's testimony about prior violent acts of the victim makes corroborating evidence of those acts particularly important for an accused's claim of self-defense. We stated:
A defendant should not be limited merely to his own assertion that he had knowledge of particular violent acts, but should be allowed to produce supporting evidence to prove the reality of the particular acts of which he claims knowledge, thereby proving reasonableness of his knowledge and apprehension and the [96]*96credibility of his assertion.5
Third, according to McMorris, 58 Wis. 2d at 152, and McAllister, 74 Wis. 2d at 251, the admission of evidence of prior specific instances of the victim’s violence, whether by the testimony of the defendant or other witnesses, rests in the exercise of sound and reasonable discretion of the circuit court. The circuit court should exercise care that the evidence of specific violent acts of the victim not be allowed to extend to the point that it is being offered to prove that the victim acted in conformity with his violent tendencies. In McAllister we stated:
The accumulation of evidence as to a particular violent act of the victim, which is within the knowledge of the defendant who alleges self-defense may go beyond the legitimate purpose of establishing what the defendant believed to be the violent character of the victim and reach the point where it is only offered to prove the victim acted in conformity with the prior violent behavior. It is the duty of the trial [97]*97judge to exercise discretion in excluding evidence which is offered in such a manner. . .. McAllister, 74 Wis. 2d at 251.
As we stated previously, the issue before us is whether the circuit court abused its discretion in refusing to allow the defendant to cross-examine the victim and to examine witness Ewing about specific incidents of the victim's violence of which the defendant was aware at the time of the shooting.6
To determine the basis for the circuit court's ruling to exclude the proffered evidence, we must examine the record. The circuit court first refused to allow the victim to testify on cross-examination in the state's case in chief about prior incidents of the victim's violence of which the defendant was aware. The circuit court barred this line of questioning until the defendant testified and brought into issue his state of mind at the time of the shooting. The circuit court stated that the victim "would be available later if needed."
After the defendant testified about the six incidents involving the victim's violent nature and about his fear that the victim would assault him, the defendant attempted to call the victim to cross-examine him about these six incidents and to question Ewing about the two incidents in which Ewing was involved. The circuit court refused to allow the defendant to cross-examine the victim or question Ewing about these incidents. The entire colloquy on the circuit court's ruling on the defendant's [98]*98request to recall the victim and cross-examine him reads as follows:
MR. ROBSON [defense counsel]: We'd like to recall Floyd Gregg [the victim], Your Honor, at this time.
COURT: Well I assume we are ready for the jury, then, Miss Buker?
MR. ROBSON: Yes, we are.
MS. BUKER [Assistant District Attorney]: Wait a minute. I think that Mr. Robson is calling Mr. Gregg to elicit information about specific acts of violence from a witness other than the defendant and I think that the law is not nearly so generous in that regard and that information may very well not be admissible.
COURT: Well, I'm not clairvoyant, so why do you wish to recall Mr. Gregg?
MR. ROBSON: I intend to ask Mr. Gregg if he in fact did do the incidents referred to in the testimony of the defendant and if in fact he did brag to the defendant about taking the life of a person in Rockford. If he admits those, I guess we don't need to go into them any further. If he denies them, we have rebuttal testimony to offer impeaching testimony.
COURT: Well, does the State intend to introduce any testimony contrary to what Mr. Daniels has put in the record, counsel?
MS. BUKER: I don't know. I mean, I guess if he is allowed to question Mr. Gregg about those incidents I would also have some questions for Mr. Gregg about them.
COURT: Well, we already have the specific prior instances of alleged violence on the part of the victim which the defendant claims he knew of at the time of the offense. And that those were admitted to go to his state of mind at the time of the alleged offense in question. Unless and until the State puts [99]*99those in issue, why do we need any additional testimony?
MR. ROBSON: Judge, I. . .
COURT: The issue is whether or not knowing those things he acted as a reasonably prudent person would under the same or similar circumstances. We already got them in with his testimony which at this point is uncontradicted.
MR. ROBSON: I believe that those issues — those items are corroborating to what the defendant has testified to as corroborating evidence that they are perfectly admissible.
COURT: Well, he's already testified to those things, and that he had those things in his mind at the time of this offense.
MR. ROBSON: Now, I also have a witness, Tom Ewing, here, Your Honor. And Tom Ewing, in addition to testifying to some of those incidents, would also be willing and able to offer an opinion as to Mr. Gregg's violence, propensity for violence.
COURT: Well, I think we have gone as far as the rule allows which permitted you to show that the defendant allegedly knew of specific instances of violence on the part of the victim.
MR. ROBSON: If the State attempts to show that that is self-serving or that it should in any way be discounted—
COURT: Well, unless and until the State does that, counsel, I am not prepared to permit any further testimony in that regard.
MR. ROBSON: And if they do that in final argument—
COURT: Well, I assume that the State may argue that the defendant may or may not be believable, but both counsel will be restricted at the time of final argument to the facts in evidence and reasonable inferences therefrom. But I think we have gone as far as the rule lets us on that part; if that's the only [100]*100purpose of calling Mr. Gregg I will sustain the objection of the State to his testimony — further testimony—
MR. ROBSON: Judge, I — then the ruling is that there is to be no further testimony about the specific instances from any other individual, even though that other individual may have been involved?
COURT: That's correct. (Tr. 40-153-56) (emphasis supplied).
The circuit court thus limited the defendant to proving the reasonableness of his fear of the victim by Ewing's opinion about the victim's reputation for violence and by his own self-serving testimony about six incidents of which the defendant was aware in which the victim exhibited a proclivity to violence. As the circuit court recognized, the defendant's credibility about his knowledge of the victim's prior violent activity was at issue. Yet the circuit court refused to admit any evidence that corroborated the incidents, the defendant's knowledge of these incidents, and the reasonableness of the defendant's fear of the victim. The defendant argues that the circuit court abused its discretion.
We have often stated that the circuit court's exercise of discretion is not the equivalent of unfettered decision making. The record on appeal must reflect the circuit court's reasoned application of the appropriate legal standard to the relevant facts in the case. If the circuit court applied the wrong legal standard, that is, if the circuit court based its decision on an error of law, this court will reverse the circuit court's decision as an abuse of discretion. Hedtcke v. Sentry Ins. Co., 109 Wis. 2d 461, 472, 326 N.W.2d 727 (1982); State v. Hutnik, 39 Wis. 2d 754, 763, 159 N.W.2d 733 (1968).
[101]*101Accordingly we must first determine the basis of the circuit court's ruling that the victim and the witness Ewing could not testify about the incidents the defendant described as showing his state of mind of reasonable apprehension of the victim.
The defendant contends that the circuit court based its refusal to admit the proffered evidence on an erroneous conclusion that the evidence was not admissible as a matter of law. In contrast, the state asserts that the circuit court knew that the proffered evidence was admissible under the law but refused to admit it in the exercise of its discretion. We conclude that the exchange among the assistant district attorney, defense counsel, and the bench reveals that the circuit court excluded the proffered evidence on the mistaken view that the law allows only the defendant to testify about the victim's prior specific violent acts to prove the defendant's state of mind.
We reach this conclusion for three reasons. First, the assistant district attorney apparently objected to the proffered evidence on the grounds that it was not admissible as a matter of law. The assistant district attorney argued to the court: "I think that the law is not nearly so generous" when a victim testifies regarding his prior violent acts as compared to a defendant testifying regarding the victim's prior violent acts. A victim's testimony "may very well not be admissible." The assistant district attorney did not ask the circuit court to exercise its discretion to exclude the evidence.
Second, the circuit court spoke in terms of excluding the evidence because of a rule of law, not as a matter of discretion. The circuit court referred to the rule of law twice. First it stated: "Well, I think we have gone as far as the rule allows which permitted you to show that the [102]*102defendant allegedly knew of specific instances of violence on the part of the victim." The circuit court again stated it excluded the evidence because of a "rule," saying that "we have gone as far as the rule lets us on that part . . We read these words to mean that the circuit court believed the proffered evidence was excluded as a matter of law, not as a matter within the discretion of the circuit court.
The circuit court's view that its ruling to exclude the proffered evidence does not rest on discretion is further manifested by a comparison of the colloquy quoted above regarding the cross-examination of the victim with the circuit court's discussion of the admissibility of the defendant's own testimony about the victim's prior violent conduct. The circuit court clearly stated that the admission of the defendant's own testimony about the victim's prior conduct was within its discretionary powers: the circuit court "has discretion under the law as to what is or is not admissible." (Tr. 39-131.) When the defendant offered proof for admission of his testimony the circuit court stated: "I am well aware of the rule that once the plateau that self-defense is arguably in the record that the defendant's knowledge of prior violent acts may be admissible in the discretion of the court if they are not too remote or otherwise effective for some other reason." (Tr. 40-110.) When the circuit court exercised its discretion to permit the defendant to testify regarding the six incidents of the victim's prior violence, the circuit court gave reasons for its discretionary ruling: "I will permit the testimony. It may possibly enlighten the jury on his state of mind at the time of the fray and determine whether or not he acted as a reasonably prudent person under the same or similar circumstances. Which is the test under self-defense . . .." (Tr. 40-124.)
[103]*103Third, the circuit court not only did not refer to its discretion in excluding the proffered evidence but it also expressed no reason for excluding the proffered evidence other than its reference to a rule. It appears reasonable therefore for this court to conclude that the circuit court was relying on a rule of law to exclude the evidence. Because no rule of law requires the exclusion of the evidence, we must conclude that the circuit court rested its decision on an erroneous view of the law.7 Thus the circuit court abused its discretion.
The state urges us to interpret the circuit court's refusal to admit the proffered evidence as exhibiting a proper exercise of discretion, not as resting on an error of law. The state reminds us that when the circuit court applies the correct rule of law and sets forth no reasons or inadequate reasons for its exercise of discretion applying the correct rule of law, this court may engage in its own examination of the record and determine whether the facts in the record support the circuit court's decision. The state relies on State v. Alsteen, 108 Wis. 2d 723, 727-28, 324 N.W.2d 426 (1982); State v. Pharr, 115 Wis. 2d 334, 343, 340 N.W.2d 498 (1983); State v. Fishnick, 127 Wis. 2d 247, 257, 127 N.W.2d 272 (1985). We agree with this statement of the law.
Other than the rule of law, the only explanation we can glean from the record of why the circuit court refused to admit the proffered evidence is that the circuit court believed the evidence was only marginally probative. The circuit court stated that the acts the defendant testified to were uncontroverted and implied that evi[104]*104dence corroborating the defendant's testimony was not needed. This reasoning is, as we pointed out in McAl-lister, fallacious.
Evidence corroborating the defendant's self-serving testimony on the only issue in the case, the defendant's state of mind, would be highly persuasive to the fact finder. The mere fact that the state does not contest the defendant's testimony about the victim does not obviate the defendant's need to bolster his own testimony with testimony of other witnesses, especially that of the victim himself. As McAllister makes clear, the defendant should not be limited merely to his own assertion but should be allowed to produce supporting evidence to prove the reality of the particular acts of which he claims knowledge.
The state's brief supplies two reasons the circuit court might have used to exclude the proffered evidence. The state's primary argument is that the circuit court could have excluded the evidence because admitting it would have resulted in a confusing "mini-trial" on whether the victim committed any or all of these violent acts. This argument confuses the facts to be proved. The only fact to be proved is the defendant's state of mind, that is, whether the defendant had grounds to believe the victim was violent on previous occasions so that at the time of the shooting the defendant's conduct was reasonable. The trial need not have become a trial about the details of the incidents, because the exact details of the six incidents are not relevant to the case at bar. The defendant did not attempt to introduce repetitive evidence about the factual basis for his testimony but instead sought to prove that his beliefs about the victim's violence, based on incidents of which others were [105]*105also aware, were reasonable and shared by others who knew the victim. The corroborative testimony was very significant to the defendant's case and the risk of the trial deteriorating into a series of mini- or collateral trials could be reduced if the circuit court limited counsel to questions relevant to the defendant's state of mind.
The state also argues that the proffered evidence had the potential for unduly lengthening the trial, confusing the jury, complicating the trial, and prejudicing the state's case with "bad character evidence." The state appears to be referring to our caution in McAllister that the accumulation of evidence about a particular violent act of the victim within the knowledge of the defendant may go beyond the legitimate purpose of establishing what the defendant believed to be the violent character of the victim and serve only to prove the victim acted in conformity with the prior violent behavior. McAllister, 74 Wis. 2d at 251. In McAllister this court affirmed the circuit court's refusal to admit duplicative evidence corroborating the reality of the occurrence of the victim's violent acts about which the court had already admitted corroborating evidence.
In this case the evidence the circuit court refused to admit was not duplicative of evidence already admitted. In this case the circuit court allowed no corroborating evidence about the victim's specific violent acts or the defendant's knowledge of the acts.8 Thus the facts in this [106]*106record do not justify the application of the McAllister caution about the circuit court's exercising discretion to [107]*107refuse to admit duplicative evidence on the ground that the evidence would serve only to prove that the victim acted in conformity with prior violent behavior.9
The circuit court expressed neither of the rationales the state proposes. Furthermore the facts in this record do not support the state's suggested rationales.
The state argues that if this court were to find an abuse of discretion in this case, the circuit court, on remand for a new trial, would have to admit all the [108]*108corroborating evidence the defendant wishes to present. We do not agree with the state's position. McMorris allows the admission of opinion and reputation evidence and evidence of the victim's prior violent acts known to the defendant under limited circumstances. The defendant must be charged with an assault or a homicide. The defendant must introduce a factual basis for a self-defense claim. The evidence of the victim's prior specific acts must be relevant to the defendant's state of mind at the time of the altercation and its admissibility rests on the sound discretion of the circuit court.
The circuit court need not allow all the evidence an accused wishes to introduce. The circuit court cannot, however, without reason supported by the record, refuse to admit in a case like this all of the corroborating evidence the accused proffers. The circuit court's discretion to refuse to admit proffered corroborating evidence will be upheld only when a reasonable rationale exists that is supported by the facts in the record.
As the defendant's brief correctly points out, the defendant would have no cause to complain had the circuit court exercised its discretion to prevent repetitive questioning, confusion of issues or interrogation that was only marginally relevant. The defendant correctly concedes that the circuit court could have permitted limited testimony by Ewing to corroborate the defendant's testimony that the defendant had observed the victim assault Ewing and observed, along with Ewing, the victim pistol whip a third man. The defendant agrees, and properly so, that it would have been entirely appropriate for the circuit court to control this testimony to prevent needless rehashing of the details of these incidents. (Defendant's Brief, p. 30.)
[109]*109Assuming the circuit court exercised its discretion on a correct interpretation of the law, and we have held the circuit court did not apply the correct law, the abuse of discretion in this case was the circuit court's total ban, without any reasonable rationale existing in the record, of all non-cumulative corroborating evidence.
The state argues that if the circuit court erred in excluding the evidence, it was harmless error. We are unpersuaded by this argument. The excluded evidence would have helped establish the defendant's privilege of self-defense, namely, the defendant's state of mind and the reasonableness of his actions. The evidence excluded was highly relevant to the claim of self-defense and was needed to bolster the defendant's credibility. The defendant was particularly anxious to question the victim in this case about his boast about killing a biker with a tire iron. The victim's flaunting of his brutal act was especially important to support the reasonableness of the defendant's actions.
Furthermore, in its closing statement the state challenged the defendant's testimony about the victim's six prior incidents of violence. During closing argument the assistant district attorney intimated, over defendant's objections, that the victim had been unfairly treated because he had not been able to testify about the six incidents and that the victim's testimony would have contradicted the defendant's version of the six incidents. The court of appeals concluded that these comments amounted to prosecutorial misconduct. We need not decide that issue. For our purposes here we need only note that the closing argument made the circuit court's [110]*110exclusion of the proffered evidence more damaging to the defendant.
We conclude that in this case a reasonable possibility exists that the error contributed to the conviction. We therefore cannot conclude that the exclusion of the evidence was harmless error. State v. Dyess, 124 Wis. 2d 525, 543, 370 N.W.2d 222 (1985).
For the reasons set forth we affirm the decision of the court of appeals reversing the conviction of the circuit court.
By the Court. — The decision of the court of appeals is affirmed.