Affirmed by published opinion. Judge MOTZ wrote the opinion, in which Judge WIDENER and Judge DUNCAN joined.
OPINION
Dexter Lee Vinson appeals the denial of his federal habeas petition, in which he sought relief from a death sentence. We granted a certificate of appealability on three issues: (1) whether the district court erred in failing to hold an evidentiary hearing on Vinson’s claim that his trial *416 counsel operated under an unconstitutional conflict of interest; (2) whether Vinson was denied effective assistance of counsel; and (3) whether the state failed to disclose material exculpatory evidence. For the reasons that follow, we affirm the district court’s denial of habeas relief.
I.
In December 1998, a Virginia jury convicted Dexter Lee Vinson of the capital murder of Angela Felton, object sexual penetration, abduction with intent to defile, and carjacking. 1 In a separate sentencing proceeding, the jury sentenced Vinson to life in prison for each of the three non-capital offenses, and to death on the capital murder charge, finding that the crime was “outrageously or wantonly vile, horrible or inhuman in that it involved torture, depravity of mind, aggravated battery to the victim,” and that there was “a probability that he would commit criminal acts of violence that would constitute a continuing serious threat to society.” The Supreme Court of Virginia affirmed.
Vinson v. Commonwealth,
Under the Anti-Terrorism and Effective Death Penalty Act of 1996 (“AEDPA”), 28 U.S.C.A. § 2254(d) (West Supp.2005), federal courts reviewing petitions for habeas relief must give great deference to state court judgments on the merits. A writ should not be granted on any claim adjudicated on the merits by the state court unless the decision was “contrary to, or involved an unreasonable application of, clearly established Federal law, as determined by the Supreme Court of the United States,” or was “based on an unreasonable determination of the facts in light of the evidence presented in the State court proceeding.” Id.
II.
Vinson initially contends that the district court erred in not granting him an evidentiary hearing on the question of whether his trial counsel labored under a conflict of interest.
Vinson argues that under
Townsend v. Sain,
*417
Vinson relies on
Cuyler v. Sullivan,
Vinson’s conflict of interest claim arises from the undisputed fact that during his trial, Vinson’s “second chair” counsel, Tanya Lomax, was suing Vinson’s lead counsel, John Underwood, for employment discrimination that had allegedly occurred during Lomax’s employment at the Portsmouth Public Defender’s Office. Vinson contends that the separate employment litigation between Lomax and Underwood adversely affected his representation in two ways: first, Lomax suffered health problems resulting from the stress of the litigation; and second, the way Underwood and Lomax divided the work and responsibilities of his case into distinct guilt and sentencing phases left Lomax inadequately supervised by Underwood.
When Vinson raised this claim for the first time in the state habeas proceedings, the Supreme Court of Virginia held that the claim was barred under state law because it could have been brought on direct appeal.
See Slayton v. Parrigan,
Rather than relying on evidence not “reasonably available” to him “at the time of the state proceeding,” Vinson instead “point[s] to evidence” that he clearly “knew about” at the time of his trial. Pri- or to trial Lomax informed Vinson of the facts giving rise to the asserted conflict, and Vinson consented to representation by “conflicted” counsel. In a sworn, written waiver, Vinson explicitly stated that “[w]ith full knowledge and understanding of Attorney Lomax’s complaint and disclosure, I freely and voluntarily give my consent to have Attorney Lomax continue to represent me in the above-styled matter.” In Vinson’s presence, defense counsel then presented Vinson’s waiver to the trial court. In light of this waiver, it is plain *418 that the facts of the alleged conflict between Lomax and Underwood were not only available to Vinson, but were specifically presented to him for his consideration and consent. His voluntary, knowing, and informed decision to continue with Lomax as his counsel precludes any argument that a factor external to the defense caused the procedural default. Vinson thus does not depend on facts that could not have been previously discovered, and he cannot establish cause to overcome the procedural bar. 2
In addition to its holding that the claim was procedurally barred from habeas review, the Supreme Court of Virginia also rejected Vinson’s conflict claim on the merits. Sworn statements from both Underwood and Lomax stated inter alia that the discrimination suit had no effect on their representation of Vinson, that the two lawyers had a good working relationship with no friction, problems or issues during their representation of Vinson. The court explained that Vinson was fully informed by counsel of the details of the conflict and was told he could obtain alternate counsel, but that he decided to continue with Lomax as his counsel. Consequently, the state court held that there was “no evidence that an actual conflict of interest existed between lawyer and client.”
Given these facts, we can hardly find the state court’s rejection of Vinson’s conflict of interest claim on the merits contrary to or an unreasonable application of clearly established Supreme Court precedent.
See id.
§ 2254(d). The Court has explained that to succeed on a conflict of interest claim, a petitioner must establish that “ ‘his counsel
actively represented
conflicting interests,’” and that this conflict “adversely affected his counsel’s performance.”
Mickens v. Taylor,
In sum, we must reject Vinson’s argument that the district court erred in refusing to provide him an evidentiary hearing on his conflict claim. The facts underlying Vinson’s claim were available to him at the time of the state court proceedings, he expressly consented to any alleged conflict, and he does not proffer facts that establish constitutional error.
III.
Vinson next asserts that he was denied effective assistance of counsel in violation of
Strickland v. Washington,
To prove a Sixth Amendment violation under
Strickland
a defendant must demonstrate “that counsel’s performance was deficient,” and that this “deficient performance prejudiced the defense.”
Id.
at 687,
Vinson raises several ineffective assistance contentions. He challenges various trial decisions of his lawyers, their preparation of mitigation and other sentencing evidence, and their response to prosecution *419 evidence as to future dangerousness. The Supreme Court of Virginia adjudicated each of these claims on the merits and determined that Vinson had failed to establish ineffective assistance under Strickland. For the reasons that follow, we conclude that none of the Virginia court’s rulings constitutes an unreasonable factual determination or is contrary to or an unreasonable application of Supreme Court precedent.
Vinson argues that his counsel failed to sufficiently investigate the nature and extent of the perjured testimony of a grand jury witness, Priscilla Turner, prior to deciding not to call her as a witness at trial, and that they failed to object to assertedly erroneous statements made by the prosecutor in closing arguments. The state court examined these allegations, determined that Vinson’s counsel made these decisions for strategic reasons, and found that neither decision violated the performance or prejudice prong of
Strickland.
On habeas review, a federal court generally credits “plausible strategic judgments in the trial of a state case.”
Bunch v. Thompson,
The Virginia court also carefully considered Vinson’s claims that his counsel did not adequately present the argument that Vinson lacked the requisite intent to defile, did not provide Vinson’s court-appointed psychologist, Dr. Schlichter, with adequate information, and failed to investigate and present evidence of Vinson’s background for mitigation purposes. The state court rejected these contentions, finding that presenting evidence as to whether Vinson had the requisite intent to defile would have been inconsistent with Vinson’s defense that he did not commit the crime at all. The court further found that counsel responded to Dr. Schlichter’s requests for information, secured an additional expert witness at the doctor’s request, and spoke with him on numerous occasions.
The record also reveals that, although they were requested to supply mitigation information, Vinson and his family failed to do so, but that nevertheless defense counsel independently discovered mitigation evidence. At sentencing, Vinson’s counsel presented a mitigation case that included Vinson’s school records and favorable testimony from Vinson’s mother, his step-father, two court-appointed expert witnesses, a previous employer, Vinson’s high school band leader, a parole officer, and a church leader. The case at hand thus stands in stark contrast to
Wiggins,
on which Vinson heavily relies. There, the Court found constitutionally ineffective counsel who relied
solely
on three documents and failed to investigate further or present
any
mitigation evidence on the defendant’s background despite information in these documents that could have been used to uncover helpful mitigation information.
Wiggins,
Finally, the Supreme Court of Virginia examined Vinson’s argument that counsel failed to respond sufficiently to the prosecution’s expert testimony as to future dangerousness. Vinson’s counsel explained that she relied on the defense expert’s advice about how best to discredit the prosecution’s expert. She thus focused her cross-examination on the fact that the prosecution’s expert made his conclusions after meeting with Vinson for only an hour, and without conducting any tests of his own. The court concluded that this reliance on the defense expert’s advice did not violate the performance prong of *420 Strickland. We do not find this assessment of Lomax’s method and strategy of examination to be unreasonable or contrary to Strickland.
All of Vinson’s ineffective assistance of counsel claims were deemed insufficient to satisfy either the performance or prejudice prongs of Strickland by the Virginia court, and we conclude that these holdings are neither contrary to nor involve an unreasonable application of established Supreme Court precedent. These claims therefore provide no basis for habeas relief.
IV.
Vinson also asserts entitlement to habe-as relief on the ground that Virginia withheld material exculpatory evidence from him in violation of
Brady v. Maryland,
Under
Brady,
“the suppression by the prosecution of evidence favorable to an accused upon request violates due process where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution.”
Id.
at 87,
Vinson contends that the prosecution inadequately disclosed the extent to which one of its grand jury witnesses, Priscilla Turner, perjured herself. Rather than informing Vinson that Turner’s entire testimony was false, the Government’s disclosure indicated that one part of her testimony was false and that it would not call her as a witness at trial. 3 The Supreme Court of Virginia, noting that “the Commonwealth attached Turner’s statement to the police” to its Supplemental Discovery and Exculpatory Evidence submission and “informed the defense that Turner would not be testifying at trial,” determined that that disclosure was constitutionally sufficient. We cannot hold the state court’s determination contrary to, or an unreasonable application of, Brady. In fact, in sworn affidavits, defense counsel stated that based on the Government’s disclosure, they proceeded as if Turner’s entire testimony were false. Thus, the state court’s conclusion that the disclosure sufficed to satisfy Brady was hardly unreasonable.
Other asserted Brady violations center on the testimony of Vertley Hunter, a critical eyewitness who testified for the Government. Vinson contends that Hunter made several exculpatory and material *421 statements that were not disclosed to him at the time of his trial. He argues that Hunter made a statement contained in some handwritten notes in the prosecution’s files in which she claimed to have seen the perpetrator at a time when Vinson was at work, a statement that conflicts with one Hunter made in an affidavit submitted in the state habeas proceedings in which she claimed she never saw Vinson again after the time of the crime. Vinson also points to a statement made in an affidavit not submitted until the federal habeas proceedings in which Hunter claimed to have seen the perpetrator at a time that Vinson was undisputedly in police custody, and in which she contended the prosecution threatened her into testifying. Vinson further claims Brady error from the Government’s failure to disclose that there was a pre-existing relationship between Hunter and Turner, and that the second eye-witness, Janice Green, stated that she did not know whether she would recognize the perpetrator if she saw him again.
The Supreme Court of Virginia concluded that even if the statement in the handwritten notes regarding the second sighting of the perpetrator was made by Hunter, it was not material since, given the substantial evidence against Vinson, there was “no reasonable probability that had the [handwritten] notes been disclosed the result of Vinson’s trial would have been different.” The court also explained that there was no evidence that the Government knew of the relationship between Hunter and Turner, and in any event, it was immaterial. And it further found that, even assuming Green’s statement could have been used for impeachment, it too was not material.
Again, AEDPA governs our review of the conclusions of the state court as to the materiality of the handwritten statement and the relationship between Hunter and Turner, and whether the presence of substantial physical and forensic evidence demonstrating Vinson’s guilt weighed against the materiality of the suppressed evidence. In particular, the record reveals that the Government presented evidence of blood on Vinson’s shorts matching the DNA of the victim, Vinson’s fingerprints on the car in which the victim was abducted and in the house where the victim’s body was found, and eyewitness testimony identifying Vinson as the man who abducted the victim and as the person who pulled a board off of the abandoned house and dragged something heavy inside. Given this evidence, 4 we can only conclude that the state court’s adjudication that the withheld evidence was not material is not contrary to or an unreasonable application of Brady, and that the additional statements contained in Hunter’s federal habeas affidavit are insufficient to demonstrate a reasonable probability of a different result.
Vinson’s final
Brady
contention is that the materiality analysis conducted by the state court was flawed. He argues that the cumulative effect of the exculpatory evidence suppressed by the Government caused actual prejudice and that habeas relief is therefore required under
Kyles v. Whitley,
V.
For the foregoing reasons, the judgment of the district court denying habeas corpus relief is AFFIRMED.
Notes
. A -description of the underlying facts involved in these dreadful crimes can be found in the Supreme Court of Virginia’s decision on Vinson’s direct appeal.
See Vinson v. Commonwealth,
. Because Vinson cannot show cause, his
Kee-ney
claim also fails.
. Related to this argument is Vinson’s contention that the Government's insufficient disclosure that perjured testimony was used to obtain his indictment violated his rights under
Brady
and
Napue v. Illinois,
. This evidence also forecloses Vinson's claims that he is entitled to a mandatory evidentiary hearing regarding the conflicting affidavits prepared by Hunter. Vinson simply cannot show the required actual prejudice in view of the substantial evidence presented at trial.
See Keeney,
