OPINION
This is a direct appeal from the judgments of two sentences of death imposed on Lawrence Smith (“Appellant”). 1 For the reasons expressed in this opinion, we affirm the first degree murder convictions but reverse his sentences of death and remand for a new penalty hearing.
On February 2, 2000, Appellant and an accomplice robbed Songha Willis (“Willis”) and several other people in a parking lot adjacent to a night club in Philadelphia. During the course of the robbery, Appellant shot and killed Willis.
On April 26, 2000, Appellant perpetrated yet another robbery at the same parking lot. During the course of this robbery, Appellant shot and killed Raeneal Quann (“Quann”). Appellant fled the scene, but was captured the next day in New Jersey.
Appellant was tried before a jury. He was found guilty of two counts of first degree murder, one count of attempted murder, five counts of robbery, two counts of criminal conspiracy, and two counts of possessing instruments of crime. The matter then proceeded to the penalty phase. With regard to the Willis, murder, the jury found three aggravating circumstances: the defendant committed the killing while in perpetration of a felony, 42 Pa.C.S. § 9711(d)(6); the defendant created a grave risk of death to another person in committing the offense, 42 Pa.C.S. § 9711(d)(7); and the defendant had a significant history of felony convictions involving the use or *397 threat of violence to the person, 42 Pa.C.S. § 9711(d)(9). With regard to the Quann murder, the jury found four aggravating circumstances: the defendant committed the killing while in perpetration of a felony, 42 Pa.C.S. § 9711(d)(6); the defendant created a grave risk of death to another person in committing the offense, 42 Pa.C.S. § 9711(d)(7); the defendant had a significant history of felony convictions involving the use or threat of violence to the person, 42 Pa.C.S. § 9711(d)(9); and the defendant had been convicted of another murder committed either before or at the time of the offense at issue, 42 Pa.C.S. § 9711(d)(ll). The jury found no mitigating circumstances and returned sentences of death.
The trial court formally imposed the death sentences. It also sentenced Appellant to an aggregate term of twenty to forty years imprisonment on the remaining convictions. Appellant then filed the instant appeal to this court.
In his appeal, Appellant does not challenge the sufficiency of the evidence to sustain his first degree murder convictions. Nevertheless, we are required to review the sufficiency of the evidence as this is a capital matter.
See Commonwealth v. Rainey,
At trial, Ted Patterson (“Patterson”) and Todd Rose (“Rose”), two of the victims who survived the February 2, 2000 robbery, testified against Appellant. Patterson and Rose testified that on the night of the crime, Appellant and Appellant’s accomplice brandished guns and demanded that Patterson, Willis, and Rose turn over their valuables. During the course of the robbery, Appellant ordered Willis to lie face-down on the ground; Willis complied. Once he was done relieving Willis of his valuables, Appellant shot Willis twice in the head; at the time he was shot, Willis was still lying face-down on the ground. This evidence was clearly sufficient to establish that Appellant was guilty of first degree murder in connection with the killing of Willis.
As to the murder of Quann, the evidence was sufficient to sustain the first degree murder conviction. Extensive testimony was received that on April 26, 2000, Appellant and three accomplices perpetrated another armed robbery at the same parking lot in which Appellant had killed Willis. During the course of this robbery, Appellant and his cohorts beat one of their victims. Appellant and his accomplices then retreated to their automobiles; as they did, Appellant, along with his co-conspirators, fired multiple shots into the crowd of people gathered outside the club. One of these bullets struck Quann in the head, killing him. This evidence is clearly sufficient to sustain the first degree murder conviction.
Gibson,
Appellant raises three issues in his brief to this court. The first is a claim that the first degree murder convictions are against the weight of the evidence. He contends that they are *399 against the weight of the evidence because the jury did not credit Appellants version of events as contained in his statement to police. Appellant asserts that the convictions are “shocking” because they show that “the jury did not credit [the] most truthful and reliable eyewitness to the crimes, the Appellant.” Appellants brief at 28.
In reviewing this claim, we are mindful that
a new trial can only be granted on a claim that the verdict was against the weight of the evidence in the extraordinary situation where the jury’s verdict is so contrary to the evidence that it shocks one’s sense of justice and the award of a new trial is imperative so that right may be given another opportunity to prevail. An appellate court cannot substitute its judgment for that of the finder of fact.
Commonwealth v. Drumheller,
We conclude that the trial court did not abuse its discretion in denying Appellant relief on this claim. The jury’s guilty verdicts on the two homicide charges were not so contrary to the evidence as to shock the conscience; in fact, the weight of the evidence supported, rather than contradicted, the jury’s verdict. Furthermore, Appellant cannot prevail on his claim merely because he believes that of all the evidence presented at trial, his statement was the most truthful. It is within the province of the jury, as the finder of fact, to decide whether a witness’ testimony lacks credibility.
Commonwealth v. Fisher,
Appellant’s next two issues regard the penalty phase. We will first address Appellant’s claim that the prosecutor improperly referred to Appellant being convicted of assaulting another prisoner with a weapon. See N.T., 2/25/2002, at 114. 2 The prosecutor made such a statement in order to impeach Appellant’s psychiatric expert who had opined that Appellant presented no danger to anyone in the prison population. Appellant asserts that there was no record evidence that Appellant had ever been convicted of assaulting another prisoner. Thus, he claims that the prosecutor improperly referenced a fact that was not in evidence.'
It is axiomatic that a prosecutor is “limited to making comments based upon the evidence and fair deductions and inferences therefrom.”
Commonwealth v. Joyner,
The Commonwealth, however, claims that the conviction is a fact of record. In support of this claim, it points to testimony offered by the Commonwealth’s psychiatric expert, Dr. John O’Brien (“Dr. O’Brien”). The Commonwealth notes that on *401 direct examination, Dr. O’Brien indicated that Appellant was found guilty on the assault charge. N.T., 3/01/2002, 44-45.
The Commonwealth accurately recounts Dr. O’Brien’s testimony. Yet, that does not end our inquiry. Next we must determine whether this testimony, standing alone, serves to establish that Appellant was indeed convicted of assaulting a' fellow prisoner, thus rendering the prosecutor’s remark as being properly based on a fact of record.
We conclude it does not. There is no indication that Dr. O’Brien was present at, or somehow participated in, the alleged adjudication of Appellant on the charge of assaulting a prisoner. We therefore cannot find that his testimony regarding the alleged conviction constitutes evidence on the basis that he had personal knowledge of the conviction. See Pa. R.E. 602 (“A witness may not testify to a matter unless evidence is introduced sufficient to support a finding that the witness has personal knowledge of the matter.”). Furthermore, Dr. O’Brien’s status as an expert does not, in and of itself, render his unsupported reference to Appellant’s alleged conviction of assaulting a fellow prisoner into a fact of record. Thus, we find that the prosecutor’s reference to Appellant’s alleged conviction for assaulting another prisoner improperly referenced a fact not of record.
Having concluded that there was error, we now turn to examining whether this error was harmless. In conducting this examination, we note that it is the burden of the Commonwealth to convince this court that the error was harmless.
Commonwealth v. Young,
Furthermore, we do not perceive how the Commonwealth could meet this burden. Harmless error may be established in one of three ways: (1) the error did not prejudice the defendant or the prejudice was only
de minimis;
(2) the erroneously admitted evidence was cumulative of other properly admitted evidence; or (3) “the prejudicial effect of the error is so insignificant by comparison to the other evi
*402
dence that it is clear beyond a reasonable doubt that the error could not have contributed to the jury’s decision regarding the death penalty.”
Commonwealth v. Edmiston,
The Commonwealth could not meet the first two alternatives of establishing harmless error. The prejudicial effect of the prosecutor’s statement that Appellant had been convicted of assaulting a fellow prisoner could certainly not be considered de minimis, particularly when taken in the context of impeaching Appellant’s expert on his opinion that Appellant posed no threat to the prison population. Furthermore, it was not cumulative of other properly admitted evidence; our review of the record reveals that there was no other properly admitted evidence regarding whether Appellant was convicted of assaulting a fellow inmate.
Finally, we do not believe that the Commonwealth could establish that “the prejudicial effect of the error is so insignificant by comparison to the other evidence that it is clear beyond a reasonable doubt that the error could not have contributed to the jury’s decision regarding the death penalty.”
Edmiston,
Accordingly, we conclude that the prosecutor improperly referred to a fact not of record and that the Commonwealth has failed to establish that this error was harmless. 3 Thus, while we affirm the convictions for first degree murder, we *403 must reverse the sentences of death and remand for a new penalty hearing.
Notes
. Sentences of death are subject to automatic review by this court. 42 Pa.C.S. § 9711(h)(1).
. While Appellant lodged no objection to the prosecutor’s statement at trial, this issue is saved from a finding of waiver via the relaxed waiver doctrine.
We acknowledge that we recently abrogated the relaxed waiver doctrine; yet we did so prospectively only.
Commonwealth v. Freeman,
. Because we are reversing the sentences of death based upon this claim, we need not reach the merits of Appellant’s other penalty phase issue.
