OPINION
Justice SAYLOR.
This is an appeal in a capital case from an order denying post-conviction relief.
On August 3, 1981, Appellant entered a drinking establishment in the City of Philadelphia, brandished a handgun, and fired four rounds into Jamie Lamb (“Lamb”), killing him. As he was shot, Lamb fell against one of his friends, Jeffrey Rahming (“Rahming”). When Appellant turned to flee, he tripped over Edward Jackson (“Jackson”), who had dived onto the floor during the shooting; while they were on the floor together, Jackson was able to view Appellant’s face before he scrambled to his feet and ran outside. Jackson and Rahming provided police with descriptions of what they had witnessed, and in March of 1982, police conducted a lineup with Appellant. Although Rahming identified Appellant as the perpetrator, Jackson did not. Appellant was charged with Lamb’s murder; however, at the initial preliminary hearing, Rahming failed to identify Appellant, and the charges were dismissed.
While Appellant was incarcerated for an unrelated offense in October of 1983, a fellow inmate, Lawrence Gainer (“Gainer”), asked him why he had killed Lamb—Appellant responded that he had done so because Lamb had killed Appellant’s adopted brother, Ronnie Williams.1 In the summer of 1984, Gainer related Appellant’s admission to Officer John Fleming, but refused to cooperate further. In March of 1986, Gainer [445] again spoke with Officer Fleming concerning Lamb’s murder and, on this occasion, agreed to provide a statement to detectives investigating the homicide. As a result, Appellant was re-arrested.
At the ensuing jury trial, the Commonwealth’s case centered upon the testimony of Jackson, Rahming, and Gainer. Jackson described the circumstances surrounding the shooting; acknowledged that he told police that he could identify the perpetrator; stated that, although he recognized Appellant in the lineup, he selected another individual because Appellant had threatened him; and explained that he told police of the reason for his actions at the lineup one week before the trial. Jackson then identified Appellant as the individual who shot Lamb. During his testimony, Rahming began by acknowledging his prior criminal record; he then related his observations of Lamb’s killing, which he had given to police the day of the incident, and identified Appellant as having committed the crime. Like Jackson, Rahming said that Appellant had threatened him and, as a result, although he had identified Appellant at the lineup, he declined to implicate him at the preliminary hearing. Gainer testified to Appellant’s admission and to having related it to Officer Fleming. In addition, both Gainer and his girlfriend, Linda Blakney, indicated that they had received telephone calls from Appellant entreating Gainer not to testify against him, which Blakney interpreted as threatening. Appellant did not testify during the guilt phase, and the sole defense witness was Steven Whitfield, Appellant’s fellow prison inmate, who claimed that he had been in the bar at the time of Lamb’s killing and had seen the perpetrator, who was not Appellant.
The jury found Appellant guilty, and the case proceeded to a penalty hearing, during which the Commonwealth incorporated the evidence from the guilt phase and offered as aggravating circumstances that, in committing the offense, Appellant knowingly created a grave risk of death to another person in addition to the victim, see 42 Pa.C.S. § 9711(d)(7), and that Appellant had a significant history of felony convictions involving the use or threat of violence to a person, namely, robbery, [446] aggravated assault, and homicide. See 42 Pa.C.S. § 9711(d)(9). Following inquiry from the trial court, Appellant declined to present testimony from family members related to mitigating circumstances, instead testifying that he did not commit the crime, although he wished that he had, as he believed that the victim had killed his adopted brother. The jury returned a verdict of death, finding both aggravating circumstances and no mitigating circumstances. On direct appeal, new counsel was appointed, raising, inter alia, issues related to after-discovered evidence in the nature of a recantation by Rahming; trial counsel’s ineffectiveness in failing to present evidence that Appellant believed that the victim had killed Appellant’s adopted brother; and the trial court’s penalty-phase instructions, which purportedly did not explain that unanimity was not required in the finding of mitigating circumstances pursuant to the United States Supreme Court decision in Mills v. Maryland, 486 U.S. 367, 108 S.Ct. 1860, 100 L.Ed.2d 384 (1988). This Court affirmed the judgment of sentence, see Commonwealth v. Wilson, 538 Pa. 485, 520, 649 A.2d 435, 452 (1994), and the United States Supreme Court denied certiorari. See Wilson v. Pennsylvania, 516 U.S. 850, 116 S.Ct. 145, 133 L.Ed.2d 91 (1995).
On March 11, 1996, Appellant filed a counseled “Petition for Habeas Corpus Relief and Statutory Post-Conviction Relief.” See generally 42 Pa.C.S. §§ 9541-9546 (the “PCRA”). The petition set forth numerous claims of error, including, with respect to the guilt phase of the trial, allegations that trial and appellate counsel were ineffective in failing to challenge the admission of hearsay evidence that improperly bolstered the testimony of Jackson, Rahming, and Gainer, and that the Commonwealth had used perjured testimony and withheld exculpatory and discoverable evidence involving threats and coercion by the police in relation to these same witnesses. As to the penalty phase claims, Appellant averred that: trial counsel had failed to investigate and present certain mitigating evidence, namely, parental and other abuse during childhood and the existence of mental health problems; trial counsel was ineffective for failing to object to the court’s [447] exclusion of relevant mitigating evidence bearing upon Appellant’s motive for the killing; the aggravating circumstances concerning creation of a grave risk of death to another person in addition to the victim of the offense and significant history of felony convictions involving the threat or use of violence are unconstitutionally vague; the trial court erred in failing to instruct the jury that, if Appellant was sentenced to life imprisonment, he would not be eligible for parole; and the trial court erred in not instructing the jury that unanimity was not required in the finding of mitigating circumstances. In addition, the petition contained a general allegation of ineffectiveness on the part of trial and appellate counsel and asserted that the cumulative effect of each of the asserted errors denied Appellant a fair trial.
Appellant filed numerous affidavits in support of the petition, and the PCRA court conducted hearings from July of 1997 through January of 1998, focusing upon the alleged failure of the Commonwealth to disclose exculpatory evidence, the existence of an alibi,2 and the purported failure of trial counsel to investigate and present certain mitigating evidence. Regarding the exculpatory evidence claim, the proofs expanded beyond the allegation in the PCRA petition to include both nondisclosure of a criminal conviction on the part of Jackson and mental health diagnoses for Jackson and Rahming. In this regard, PCRA counsel, relying upon a 1981 pre-sentence investigation for Jackson, elicited that he had been convicted for impersonating a public servant (a police officer), see 18 Pa.C.S. § 4912,3 had suffered two fractured skulls, and had been diagnosed as easily confused and as having a weak memory. Appellant also offered expert testimony regarding Jackson’s mental health from a psychiatrist, Julie Kessel, M.D., who reviewed the 1981 psychological evaluation and [448] opined that Jackson would have difficulty recalling events accurately and “confabulates.”4 Rahming testified, recanting his identification of Appellant as the perpetrator of the homicide,5 and acknowledging that he had been diagnosed as suffering from schizophrenia; further, contrary to his trial testimony, Rahming admitted to having ingested alcohol, marijuana, and psychotropic medication at the time that he witnessed the shooting. Rahming also claimed that: a detective had offered him cocaine in exchange for his signed statement implicating Appellant; someone in the District Attorney’s Office had given him money to sign the statement; and a detective from the District Attorney’s Office had taken him to a hospital following his testimony at trial, where he was admitted for a psychiatric evaluation. As with Jackson, Appellant introduced expert testimony from Dr. Kessel, who reviewed Rahming’s mental health records and concluded that the psychiatric hospitalization following his testimony at trial suggests that he may not have been able to differentiate reality from delusion.
Appellant also presented witnesses who claimed that: Gainer had admitted to having testified falsely at Appellant’s trial; Officer Fleming was aware of a gambling business run by Gainer’s father; and Gainer provided information in exchange for police protection of his father’s business. In this same vein, Appellant called witnesses who indicated that Officer Fleming harassed and threatened Jackson, Rahming, and Gainer to incriminate Appellant.
Officer Fleming denied knowledge of a gambling business run by Gainer’s father and maintained that Gainer had supplied information voluntarily. When questioned as to whether he had ever given money to Gainer, Officer Fleming admitted to having occasionally made interest-free loans to Gainer. The assistant district attorney who prosecuted Appellant ac[449] knowledged that she would have disclosed Jackson’s conviction for impersonating a public servant had she been aware of it,6 and asserted that she did not have access to probation records, which would have revealed the existence of mental health issues concerning Jackson and Rahming. See generally Pa.R.Crim.P. 703(A) (providing for the confidentiality of presentence reports and related psychological and psychiatric reports). Moreover, she did not recall that Rahming had been taken to a hospital following his testimony for purposes of a psychiatric admission, although she noted that Rahming was homeless and had at one point lived in a shelter. The remaining guilt-phase issue developed during the hearings was the alleged existence of an alibi for Appellant, for which Appellant presented testimony from a former employer, who stated that he had checked a calendar in his shop, which he no longer had in his possession, to determine that Appellant had been working on the day of the homicide.
In his testimony concerning various guilt-phase issues, trial counsel stated that, during his conversations with Appellant, there was never any mention of a potential alibi; rather, their discussions centered solely upon challenging the identification testimony. Trial counsel testified that, had he been aware of Jackson’s prior record, he would have used it to impeach him and, similarly, had he been aware of the mental health histories of Jackson and Rahming, he would have attempted to use such information to challenge the credibility of their identifications.
Regarding the penalty phase, Appellant presented testimony from friends and family members, indicating that he was physically and emotionally abused by his mother, and that he had suffered closed head trauma at the hands of his mother and from neighborhood gang members. Appellant also presented expert testimony from two psychiatrists, Richard Dudley, M.D., and Dr. Kessel, and a neuropsychologist, Barry Crown, Ph.D., each of whom examined Appellant and reviewed 1975 psychological and psychiatric evaluations of him, together [450] with affidavits from friends and family members. Dr. Dudley concluded that Appellant suffered from serious cognitive deficits and a delusional disorder, which he characterized as an extreme mental or emotional disturbance, and which he determined was present at the time he committed the offense. Dr. Dudley noted that evidence of Appellant’s cognitive deficits was indicated in Appellant’s school records, and the 1975 mental health evaluation of Appellant prior to the offense would have raised concerns, warranting further investigation. Dr. Kessel reached similar conclusions, although she acknowledged that Appellant “was absolutely unrevealing of overt pathology” and desperately wanted to appear mentally well during her examination. According to Dr. Crown, neuropsychological testing revealed that Appellant had brain damage and a borderline IQ, which he described as a substantial impairment.
Responding to such evidence, trial counsel conceded that he did not interview witnesses or family members in preparation for the penalty phase or secure Appellant’s school or probation records, explaining that his reason for such decision was that Appellant was not interested in mitigation and was adamant in this regard. Furthermore, trial counsel emphasized that he had discussed the statutory mitigating circumstances with Appellant and the need to call upon family members, and that the trial court had similarly questioned Appellant concerning such evidence. Although noting that Appellant did not appear to be mentally impaired, trial counsel acknowledged that, had he been aware of the psychological report in Appellant’s probation records, it would have prompted further investigation.
The Commonwealth offered no evidence of its own, and the PCRA court denied relief on Appellant’s petition. In its opinion pursuant to Rule of Appellate Procedure 1925, addressing the hearsay claim of improper bolstering, the court noted that such evidence related to the prior consistent statements of Jackson, Rahming, and Gainer. Portraying Appellant’s defense as centered upon the credibility of those witnesses, the court determined that the admission of their prior [451] consistent statements during direct examination was proper. Concerning the claim of perjured testimony and recantation by Rahming, the court observed that Rahming had recanted prior to Appellant’s direct appeal, that this Court had rejected such claim, and that Rahming’s most recent recantation was inconsistent with the earlier version. The court thus determined that Appellant was not eligible for relief, since this issue had been previously litigated. Describing the evidence concerning Jackson’s purported perjury as in the form of unsubstantiated hearsay, the court found that the claim was not cognizable. The court did not discuss this allegation as it related to Gainer. The court next addressed Appellant’s alibi claim, finding that such evidence lacked any credibility, since an individual with an alibi would have informed his lawyer of it at some point between 1981 and the time of Appellant’s trial, 1988.
As to the penalty phase, and in particular the claim that trial counsel failed to present mitigating evidence, the court found that Appellant’s allegation concerning the mental health evidence was without merit, reasoning that there was no evidence to establish that Appellant suffered from the alleged mental disturbances at the time of the murder or that such evidence was available to trial counsel. Furthermore, the court indicated (erroneously) that Appellant had not produced any evidence to show that a mental health professional or any doctor had examined him prior to the commission of the murder. Thus, the court reasoned, the opinion testimony of Drs. Dudley and Crown was unconvincing, as it was unsupported by pre-existing medical evidence and, instead, was premised upon interviews of Appellant and affidavits from his friends and family members. The court also stated (also erroneously) that Dr. Dudley never examined Appellant; observed that given Appellant’s strategy of denying commission of the killing, the mitigation evidence would have weakened the evidence presented; and concluded that Appellant had failed to demonstrate that such evidence would have led the jury to find one or more mitigating circumstances that would have equaled or outweighed the aggravating circumstances. [452] The court did not otherwise address the mitigating evidence surrounding Appellant’s purported abuse during childhood or the opinions of Dr. Kessel.
Discussing Appellant’s argument that he was improperly-precluded from presenting mitigating evidence respecting motive to the jury, namely, that the victim had killed Appellant’s adopted brother, the court stated that the Supreme Court had rejected this issue on direct appeal and, in any event, the jury was able to consider Appellant’s testimony on this issue. As to the challenges involving the aggravating circumstances of a significant history of felony convictions involving the use or threat of violence and knowingly creating a grave risk of death to another, the court ruled that these circumstances were not unconstitutionally vague. The court rejected Appellant’s assertion that he was entitled to an instruction that life imprisonment in Pennsylvania means life without the possibility of parole, as Appellant’s case predated the United States Supreme Court decision in Simmons v. South Carolina, 512 U.S. 154, 114 S.Ct. 2187, 129 L.Ed.2d 133 (1994), which required the instruction where future dangerousness was at issue. Moreover, the court found that, even if such instruction was required at the time of Appellant’s trial, future dangerousness had not been placed before the jury. Likewise, the court determined that the jury instructions respecting mitigating circumstances were consistent with United States Supreme Court precedent, and that the jurors were not misled into believing that such circumstances must be found unanimously.
I. Waiver
Preliminarily, Appellant’s brief in this Court includes issues that were not pled in his PCRA petition, specifically, claims based on: the alleged failure of the Commonwealth to provide exculpatory evidence relating to Jackson’s prior crimen falsi conviction for impersonating a public servant; mental health evaluations of Jackson and Rahming that purportedly could have been used to impeach them; after-discovered evidence involving Officer Fleming and Gainer focusing upon corruption in the 39th Police District; Officer Fleming’s al[453] leged participation in such misconduct; a connection between Gainer and Officer Fleming that casts doubt on their trial testimony; and the existence of an alibi. Appellant contends that, with respect to the claims concerning exculpatory evidence involving Jackson and Rahming, these issues were included under Claim IX in the PCRA petition, in Appellant’s “renewed motion for discovery,” and in Appellant’s post-hearing memorandum. To the extent that the exculpatory evidence claims were not included in Appellant’s PCRA petition, he argues that such omission occurred only because the Commonwealth had improperly suppressed the foundation for those claims. Appellant also emphasizes that the PCRA court, without objection from the Commonwealth, permitted Appellant to present evidence and argument on these issues and, in any event, the merits of the additional claims can be reached, as the relaxed waiver rule was in effect during the disposition of Appellant’s PCRA petition.
Although Appellant’s PCRA petition included an allegation that the Commonwealth had withheld discoverable evidence, such evidence was described as coercion and threats by Officer Fleming and a detective directed against Jackson, Rahming, and Gainer, causing them to falsely incriminate Appellant. The averments supporting the allegation did not reference, most notably, Jackson’s prior conviction, the mental health evidence concerning Jackson and Rahming, or the asserted after-discovered evidence relating to Officer Fleming and Gainer. Neither Appellant’s discovery motion nor his “PostPCRA Hearing Memorandum” is a substitute for a sufficient PCRA petition and, likewise, neither can be construed as an amendment to such a petition. See generally Pa.R.Crim.P. 905(A), (D) (providing that permission to file an amended PCRA petition may be granted by leave of court and describing the requirements for such petition). While certain of the evidence supporting these claims may not have been available to Appellant when he filed his PCRA petition, particularly the mental health records of Jackson and Rahming,7 once such records were provided to Appellant, he had the opportunity to [454] pursue amendment of his petition, but failed to do so. This Court has previously rejected claims as waived in similar circumstances. See Commonwealth v. Thomas, 560 Pa. 249, 254 & n. 4, 744 A.2d 713, 715 & n. 4 (2000).8 Consequently, as Appellant failed to plead the claims involving the alleged exculpatory evidence relating to Jackson and Rahming, after-discovered evidence involving Officer Fleming, and the purported alibi, these issues are waived.
Connected with the after-discovered and suppressed evidence claims respecting Officer Fleming, Appellant also asserts error on the part of the PCRA court in denying discovery requests for information concerning purported corruption in the 39th District, refusing to permit PCRA counsel to inspect Officer Fleming’s personnel file, and disallowing Appellant from calling as witnesses certain 39th District police officers. As these allegations of error relate to claims that were not properly before the PCRA court, we will not address them here.
[455] II. Guilt Phase
Appellant first challenges the admission of hearsay in the form of prior consistent statements from the Commonwealth’s three primary witnesses, Jackson, Rahming, and Gainer, arguing that the admission of such testimony violated state evidentiary law and Appellant’s constitutional right to confront witnesses against him. See U.S. Const, amend. VI; Pa. Const. art. I, § 9. In advancing this claim, Appellant asserts (as he must to survive the waiver of the underlying claim), albeit summarily, that trial and appellate counsel were ineffective for failing to object to and litigate this error.9
To prevail on his ineffectiveness allegations, Appellant must demonstrate, inter alia, that the underlying claim is of arguable merit; no reasonable strategic basis existed for trial counsel’s failure to object; and counsel’s error resulted in prejudice, or more specifically, that there is a reasonable probability that the outcome of the proceeding would have been different. See Commonwealth v. Kimball, 555 Pa. 299, 312, 724 A.2d 326, 333 (1999).
In the first instance, Appellant fails to elaborate upon his constitutional claim, other than to assert that his right to confrontation was violated, since the statements were not admitted pursuant to a “firmly rooted” hearsay exception. The Confrontation Clause of the Sixth Amendment “provides two types of protections for a criminal defendant: the right physically to face those who testify against him, and the right to conduct cross-examination.” Pennsylvania v. Ritchie, 480 U.S. 39, 51, 107 S.Ct. 989, 998, 94 L.Ed.2d 40 (1987) (plurality opinion). These protections are not violated, where, as here, a testifying witness’s out-of-court statement is admitted and the witness is subject to full and effective cross-examination. See [456] California v. Green, 399 U.S. 149, 158, 90 S.Ct. 1930, 1935, 26 L.Ed.2d 489 (1970).
With regard to the state evidentiary law dynamic of Appellant’s claim, in general, an out-of-court statement of a witness that is consistent with his trial testimony constitutes inadmissible hearsay. See Commonwealth v. Hutchinson, 521 Pa. 482, 486-87, 556 A.2d 370, 372 (1989). Where, however, the prior consistent statement is one of identification, it is admissible as an exception to the hearsay rule as substantive evidence, regardless of impeachment, provided that the declarant is present and subject to cross-examination. See Commonwealth v. Ballard, 501 Pa. 230, 233, 460 A.2d 1091, 1092 (1983); Commonwealth v. Saunders, 386 Pa. 149, 155, 125 A.2d 442, 445 (1956); accord Pa.R.E. 803.1(2).10 Such statements also may be admitted to rehabilitate a witness whose credibility has been challenged by an express or implied charge of fabrication, bias, improper influence or motive, or faulty memory, and where the prior statement was made before the charge existed. See Commonwealth v. Counterman, 553 Pa. 370, 405, 719 A.2d 284, 301 (1998); accord Pa.R.E. 613(c). When relevant for this purpose, the statement is admissible on rebuttal for rehabilitation, but not as substantive evidence. See Commonwealth v. Vento, 410 Pa. 350, 353-54, 189 A.2d 161, 163 (1963). This general order-of-proof prescription is consistent with the rehabilitative purpose for the admission. See generally David F. Binder, Hearsay Handbook § 2:12 at 2-80 (4th ed.2001). Although such statements should therefore be introduced as rebuttal evidence, where the defense is centered upon - attacking a witness’s credibility consistent with a basis that would permit introduction of a prior consistent statement to rehabilitate, the trial court is afforded discretion to allow anticipatory admission of [457] the prior statement. See Commonwealth v. Smith, 518 Pa. 15, 39-40, 540 A.2d 246, 258 (1988).
With respect to Jackson, Appellant contends that the Commonwealth improperly bolstered Jackson’s in-court identification when he testified on direct examination that he had witnessed the shooting, that Appellant was the perpetrator, and that he had advised the police immediately following the shooting that he could identify the gunman. In addition, Appellant argues that the Commonwealth reinforced Jackson’s identification testimony by examining him respecting a statement which he had provided to detectives shortly before trial, in which he explained that, although he recognized Appellant in the lineup, he purposely identified the wrong person. For similar reasons, Appellant maintains that Rahming’s identification testimony was improperly augmented during direct examination, when the Commonwealth elicited that he had previously identified Appellant at a lineup and, on redirect examination, that he had provided a statement to detectives indicating what he had witnessed at the time of the shooting. Each of these instances, however, involved prior statements of identification from witnesses who were present and available for cross-examination. Under the circumstances, therefore, their admission was permissible. See Commonwealth v. Ly, 528 Pa. 523, 532, 599 A.2d 613, 617 (1991); Pa.R.E. 803.1(2).
With respect to Gainer, Appellant contends that it was improper for the Commonwealth to elicit his prior consistent statements on direct examination, specifically, that he had advised Officer Fleming of Appellant’s inculpatory admission to him. Appellant also maintains that it was impermissible for the Commonwealth to have Officer Fleming reiterate Gainer’s statements in which he related Appellant’s admission. Trial counsel, however, cross-examined Gainer, attacking his credibility and suggesting that his testimony was a recent fabrication or a result of a corrupt motive.11 Given counsel’s tactic, it [458] is at least arguable that the trial court would have been within its discretion to allow the Commonwealth to elicit Gainer’s prior consistent statements during his direct examination, as an exception to the general protocol for the order of proof of rebuttal-type evidence, had a timely objection to the testimony been lodged. See Smith, 518 Pa. at 39-40, 540 A.2d at 258.12 Moreover, Appellant fails to elaborate on the degree of prejudice resulting from the asserted ineffectiveness of trial counsel in failing to object, in terms of its probable impact on the outcome of the case. In such circumstances, relief is unavailable. Accord Commonwealth v. Pierce, 567 Pa. 186, 216-17, 786 A.2d 203, 221-22 (2001); Commonwealth v. DeHart, 539 Pa. 5, 15, 650 A.2d 38, 43 (1994).
Regarding the asserted failure on the part of the Commonwealth to provide exculpatory evidence of Officer Fleming’s coercion and intimidation of witnesses, the PCRA court rejected the claim in part on credibility grounds, and in part because aspects of the claim were previously litigated, see PCRA Court Opinion at 7-10; see also supra note 6, and we discern no error in the court’s determinations in this regard. While the PCRA court’s opinion fails to mention the aspect of the claim alleging coercion/intimidation of Gainer, no evidence of record supports such a claim.13
[459] III. Penalty Phase
At the outset, Appellant’s central challenges to the constitutionality of the aggravating circumstances denominated at Sections 9711(d)(7) (grave risk) and (d)(9) (significant record of prior felony convictions) of the Sentencing Code, 42 Pa.C.S. § 9711(d)(7), (9), are controlled by the prior decisional law, for example, Commonwealth v. Wharton, 530 Pa. 127, 152-53, 607 A.2d 710, 723 (1992) (upholding the Section 9711(d)(7) aggravator against a vagueness challenge), and Commonwealth v. Miller, 560 Pa. 500, 522, 746 A.2d 592, 604 (2000) (same, with respect to the Section 9711(d)(9) aggravator). We decline to accept Appellant’s invitation to reconsider those decisions here.14
With respect to the grave risk aggravator, Appellant also urges that the prosecutor’s closing argument in the penalty phase erroneously defined the circumstance as applying where individuals were placed in jeopardy or endangered (as opposed to placed in grave risk of death) and the evidence was insufficient to sustain the aggravator. Depending on grammatical construction, Appellant’s contention that the prosecutor’s suggestion that putting others “in jeopardy, even danger of death” implicates Section 9711(d)(7), N.T., Jan. 11, 1988, at 40, might give rise to a colorable objection. No objection was lodged, however, and the trial court accurately defined Section 9711(d)(7) in the jury instructions. See N.T., Jan. 11, 1988, at 46. Furthermore, Appellant’s conduct in firing a gun in a barroom with ten to fifteen people present and in close proximity, including Rahming, who was standing behind Lamb, provided a sufficient basis for the jury to [460] conclude that in shooting Lamb, Appellant created a grave risk of death' to another person. See Commonwealth v. Moore, 534 Pa. 527, 562, 633 A.2d 1119, 1136 (1993) (concluding that the evidence supported the grave risk aggravator where a bullet fired by the defendant traveled in close proximity to and could have easily harmed another). As such, and in absence of any development concerning prejudice accruing by virtue of trial counsel’s failure to object, no relief is available on this claim.
Next, Appellant argues that his constitutional right to have the jury consider mitigating evidence, see Lockett v. Ohio, 438 U.S. 586, 604, 98 S.Ct. 2954, 2964-65, 57 L.Ed.2d 973 (1978), was violated when the trial court precluded him from testifying that he believed that Lamb had killed Appellant’s adopted brother. Appellant maintains that this testimony was relevant as bearing upon the circumstances of the offense, see 42 Pa.C.S. 9711(e)(8), specifically, his motive. In addition, Appellant summarily asserts that prior counsel were ineffective for failing to raise and litigate this issue, apparently as it is apprehended that the underlying claim is waived and/or previously litigated. See Wilson, 538 Pa. at 515, 649 A.2d at 450 (discussing the jurors’ consideration of Appellant’s asserted beliefs in the relevant regard). Contrary to Appellant’s contention, however, he specifically testified to his belief respecting the murder of his adoptive brother. Although the prosecutor objected immediately following this testimony, the jury was not instructed to disregard such evidence and, on cross-examination, Appellant reiterated his belief regarding Lamb’s involvement in the murder of Appellant’s brother. Consequently, the jury was not precluded from receiving this evidence. Accord id. (noting that the defense wished for the jury to “consider that Appellant believed that the. victim, Jamie Lamb, was responsible for the murder of his adopted brother. The jury unanimously rejected this evidence as a basis for a mitigating circumstance.”). Correspondingly, counsel cannot be deemed ineffective for failing to raise a meritless issue. See Commonwealth v. Travaglia, 541 Pa. 108, 120-21, 661 A.2d 352, 358 (1995).
[461] Appellant argues that the penalty phase instructions and verdict sheet were unconstitutional in light of the United States Supreme Court decision in Mills, 486 U.S. at 367, 108 S.Ct. at 1860, as they indicated that unanimity was required for the jury to find mitigating circumstances.15 Since, however, this issue was raised on direct appeal, see Wilson, 538 Pa. at 516, 649 A.2d at 451,16 it has been previously litigated and cannot serve as a basis for relief under the PCRA. See 42 Pa.C.S. § 9543(a)(3). Nevertheless, Appellant urges reconsideration of the issue, as the decision on direct appeal was issued prior to the opinion by the United States Court of Appeals for the Third Circuit in Frey v. Fulcomer, 132 F.3d 916 (3d Cir.1997), which held, inter alia, that a penalty phase instruction substantially similar to the one at issue here violated Mills. This Court has previously determined, however, that it is not bound by the Third Circuit’s interpretation in this regard and has previously declined to accept it. See Commonwealth v. Breakiron, 556 Pa. 519, 537 n. 7, 729 A.2d 1088, 1097 n. 7 (1999); Commonwealth v. Cross, 555 Pa. 603, 612-14, 726 A.2d 333, 337-38 (1999).17 Accordingly, this issue will not be revisited in the present case.
[462] Citing to the United States Supreme Court decision in Simmons, 512 U.S. at 154, 114 S.Ct. at 2187, Appellant next argues that the trial court erred in failing to instruct the jury that Appellant would be ineligible for parole if he should be sentenced to life imprisonment, and that all prior counsel were ineffective in failing to raise and litigate this issue. A defendant is entitled to such an instruction upon request where the prosecution has placed his future dangerousness at issue, see Commonwealth v. Spotz, 563 Pa. 269, 288, 759 A.2d 1280, 1291 (2000), and Appellant argues that the Commonwealth placed his future dangerousness at issue through both testimony and argument. However, Simmons was not decided until approximately six years after Appellant was tried and, significantly, at the time of Appellant’s trial, the law in Pennsylvania prohibited juries from receiving such information. See Commonwealth v. Henry, 524 Pa. 135, 160, 569 A.2d 929, 941 (1990). Moreover, Simmons has been interpreted as creating a new rule of law, see O’Dell v. Netherland, 521 U.S. 151, 153, 117 S.Ct. 1969, 1971, 138 L.Ed.2d 351 (1997), and, as such, it may only be applied to cases on collateral review where the decision was handed down during direct review, and the issue was properly raised and preserved. See generally Fiore v. White, 562 Pa. 634, 642, 757 A.2d 842, 846-47 (2000) (articulating the standard for applying a new rule of law to a case on collateral review). Here, although Simmons was issued while Appellant’s case was on direct appeal,18 the absence of the instruction was not raised in the trial court and preserved on appeal. Consequently, as counsel cannot be deemed ineffective for failing to anticipate a change in the law, Appellant’s claim is without merit. See Commonwealth v. Rollins, 558 Pa. 532, 560, 738 A.2d 435, 451 (1999).
Appellant next contends that trial counsel’s stewardship was deficient in his failure to conduct a reasonable [463] investigation into the mitigating circumstances, which would have revealed that Appellant was emotionally and physically abused as a child, experienced trauma to his head that affected his cognitive functioning, and suffered from an impaired mental state. The Commonwealth responds that Appellant has not demonstrated that such evidence was reasonably known or available to trial counsel, particularly since Appellant advised counsel not to contact his family members and pursue mitigating evidence.
In this regard, we acknowledge that some jurisdictions require capital counsel to conduct an investigation into potential mitigation evidence to ensure that a defendant’s waiver of such proof is knowing and intelligent. See, e.g., Koon v. Dugger, 619 So.2d 246, 250 (Fla.1993) (requiring that counsel state on the record “whether, based upon his investigation, he reasonably believes there to be mitigating evidence that could be presented and what that evidence would be”). Other jurisdictions, however, do not so require, provided that the defendant’s waiver is knowing, intelligent, and voluntary. See, e.g., State v. Smith, 993 S.W.2d 6, 14 (Tenn.1999) (stating that counsel will not be adjudged ineffective for following the decision of a competent and fully informed defendant who chooses to forego investigation and presentation of mitigating evidence, and requiring the trial court to conduct an on-the-record colloquy with the defendant to protect his interests). The capital jurisprudence of this Court has aligned more closely with the latter line of cases. For example, in Commonwealth v. Michael, 562 Pa. 356, 755 A.2d 1274 (2000) (plurality opinion), the Court relied on the defendant’s waiver in declining to find his trial counsel ineffective for failing to investigate potential mitigating evidence, even though the trial court had instructed counsel to contact the defendant’s friends and family members and to prepare a penalty phase defense. See id. at 366-67, 755 A.2d at 1279-80; cf. Commonwealth v. Marinelli, 570 Pa. 622, 654-55, 810 A.2d 1257, 1275-76 (2002).19 While we are not unmindful that the adequacy of [464] counsel’s investigation affects his ability to advise a defendant concerning the meaning of mitigation evidence and possible mitigation strategy, see generally Battenfield v. Gibson, 236 F.3d 1215, 1229 (10th Cir.2001), in this case, counsel testified at-the PCRA hearing that he discussed with Appellant the mitigating factors under the death penalty statute, see 42 Pa.C.S. § 9711(e), as well as the importance of contacting family members and of presenting such evidence to humanize him in the eyes of the jurors. Moreover, prior to the penalty hearing, the trial court and defense counsel advised Appellant on the record that he could present evidence concerning his character and the circumstances of the offense, including testimony from family members. Of additional significance, Appellant does not specifically challenge the adequacy of his waiver or take issue with trial counsel’s testimony respecting their discussions; indeed, Appellant did not testify at the PCRA hearings. Under such circumstances, therefore, and although a more thorough on-the-record colloquy respecting the waiver should have been accomplished on the trial record,20 we conclude that Appellant has not established that his [465] counsel rendered ineffective assistance in following his wishes respecting the investigation and presentation of mitigation evidence. Accord Smith, 993 S.W.2d at 14 (holding that counsel will not be found ineffective for following the decision of a competent and fully informed defendant who opts to forego the investigation into and presentation of mitigating evidence).21
Finally, Appellant contends that he is entitled to relief due to the cumulative effect of the errors alleged. Having determined, however, that no individual claim has merit, Appellant is not entitled to relief based upon alleged cumulative effect. See Rollins, 558 Pa. at 562, 738 A.2d at 452.
The order of the PCRA court is affirmed.22
Justice CASTILLE files a concurring opinion.
Justice NIGRO files a concurring opinion.