Opinion by Judge LARSON; Partial Concurrence and Partial Dissent by Judge MILAN D. SMITH, JR.
LARSON, District Judge:Steve Houston, a Nevada state prisoner, appeals from the district court’s judgment denying his petition for habeas corpus pursuant to 28 U.S.C. § 2254. Houston’s ha-beas petition challenges his 2000 jury trial conviction for conspiracy to commit murder, three counts of attempted murder with the use of a deadly weapon, and three counts of discharging a firearm out of a motor vehicle.
Houston contends that his Sixth Amendment rights were violated when the state trial court denied his motion to continue the trial so he could be represented by retained counsel, and denied his appointed counsel’s motion to withdraw based on a *1079conflict of interest arising from the Clark County Public Defender’s prior representation of the prosecution’s star witness. We hold that the trial court’s denial of Houston’s motion to continue the trial did not violate the Sixth Amendment and that the Nevada Supreme Court’s rejection of this claim was neither contrary to, nor an unreasonable application of, federal law. We vacate and remand for an evidentiary hearing to determine whether Houston’s right to conflict-free counsel was violated.
I
We review de novo the denial of habeas relief by a district court. Polk v. Sandoval, 503 F.3d 903, 909 (9th Cir.2007). Houston’s § 2254 petition is governed by the Anti-Terrorism and Effective Death Penalty Act (“AEDPA”). Under AEDPA, a state prisoner is entitled to relief only if the state court ruling “resulted in a decision that 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.” 28 U.S.C. § 2254(d). A state court’s decision is “contrary to” federal law if it applies a rule of law different from one set forth in Supreme Court holdings or makes a different determination based on “materially indistinguishable facts.” Earp v. Ornoski, 431 F.3d 1158, 1182 (9th Cir.2005) (citing Williams v. Taylor, 529 U.S. 362, 405-06, 120 S.Ct. 1495, 146 L.Ed.2d 389 (2000)). “The ‘unreasonable application’ clause requires the state court decision to be more than incorrect or erroneous.” Lockyer v. Andrade, 538 U.S. 63, 75, 123 S.Ct. 1166, 155 L.Ed.2d 144 (2003) (holding that the state decision must be “objectively unreasonable”). When applying AEDPA standards, this court reviews the “last reasoned decision” addressing the issue by a state court. See Robinson v. Ignacio, 360 F.3d 1044, 1055 (9th Cir.2004). The Nevada Supreme Court’s affirmance on direct appeal is the last reasoned opinion relevant to Houston’s claims.
II
We first consider whether Houston’s Sixth Amendment rights were violated by the trial court’s denial of his motion to continue the trial.
To establish a Sixth Amendment violation based on the denial of a motion to continue, Houston must show that the trial court abused its discretion through an “unreasoning and arbitrary ‘insistence upon expeditiousness in the face of a justifiable request for delay.’ ” Morris v. Slappy, 461 U.S. 1, 11-12, 103 S.Ct. 1610, 75 L.Ed.2d 610 (1983) (citing Ungar v. Sarafite, 376 U.S. 575, 589, 84 S.Ct. 841, 11 L.Ed.2d 921 (1964)).
The record supports the state court’s conclusion that the trial judge acted within his broad discretion in denying Houston’s motion for a continuance to retain counsel. Specifically, he confirmed that counsel was able to proceed to trial, evaluated Houston’s diligence in timely retaining private counsel, and weighed the potential impact a continuance may have had on the victims and witnesses. The continuance was sought just four days before trial was scheduled to begin. See Slappy, 461 U.S. at 13-15, 103 S.Ct. 1610 (acknowledging that appropriate factors to consider include administration of justice, difficulty in assembling witnesses, bad faith delaying tactics, victims’ concerns). Moreover, the motion to continue was based solely on Houston’s desire to retain counsel because he was unsatisfied with his public defender’s preparation for trial, not on any potential conflict of interest. Indeed, the potential conflict was not discovered until after the motion to continue was denied. Accordingly, the Nevada Su*1080preme Court’s application of Slappy and denial of relief on this claim was not “objectively unreasonable.” See 28 U.S.C. § 2254(d)(1); Andrade, 538 U.S. at 75, 123 S.Ct. 1166.
Ill
Next, we consider whether Houston’s right to conflict-free counsel was violated.
A
Attorney Craig Jorgenson was appointed from the Clark County Public Defender’s office to defend Houston against charges that he fired shots from his car into a car driven by Terrance Chadwick and occupied by two of Chadwick’s sisters. Both the state and the defense agreed that there was a history of “bad blood” between Houston and Chadwick’s family. This history included the murder of Chadwick’s grandmother and the shooting of his brother, for which Houston was tried and acquitted.
After the jury had been empaneled, Jor-genson discovered for the first time that the Clark County Public Defender’s office had represented the victim and key prosecution witness, Chadwick, in a factually-related case charging Chadwick with multiple counts of attempted murder with the use of a deadly weapon. Ultimately, Chadwick pled guilty to firing a gun into a house.1
The next morning, before opening arguments, Jorgenson immediately moved to withdraw from Houston’s case because he felt conflicted by his office’s prior representation of Chadwick. Jorgenson explained that the earlier case involving Chadwick was “tied, factually, to the state’s theory of retribution and the motive” in Houston’s case and that Houston’s defense theory implicated Chadwick as the aggressor. Jorgenson told the judge that his “heart is going to be with Mr. Chadwick,” and that he believed Chadwick had not committed the crimes in the earlier case, for which Chadwick had been convicted and served a prison sentence. Such wrongful conviction, Jorgenson explained, may have given Chadwick a motive to act as the aggressor toward Houston or to lie in order to convict Houston out of revenge. Jorgenson also expressed concern that, under his cross examination, Chadwick may admit facts which would expose him to criminal liability or impact his parole status.
The judge denied the motion to withdraw, finding that no actual conflict existed because Jorgenson had not personally represented Chadwick in the previous proceeding. The judge further found that Chadwick had waived any potential conflict that may have existed by waiving his attorney-client privilege. Notably, the trial court did not seek nor require a conflict waiver from Houston.
At trial, Chadwick was the only witness who testified that Houston fired shots into the van occupied by Chadwick and his sisters. As such, his credibility was paramount.
Houston argues that the Clark County Public Defender’s prior representation of Chadwick in a factually-related case created a conflict, which adversely affected Jor-genson’s trial performance by limiting his impeachment of Chadwick through his pri- or conviction, his parole status, and his failed polygraph exam.
Based on the trial record alone, the Nevada Supreme Court denied relief on this claim because Jorgenson had not personally represented Chadwick, Chadwick had *1081waived his attorney-client privilege, and the prior representation did not involve the same facts as Houston’s case.2 The Nevada Supreme Court made no mention of the trial judge’s failure to obtain a waiver from Houston or of Jorgenson’s subjective belief that his representation was conflicted.
The district court acknowledged that Chadwick’s earlier case was “somewhat related” to Houston’s prosecution, but concluded that Jorgenson performed as any non-conflicted attorney would have. Without discussing the trial court’s failure to obtain a waiver from Houston, the district court denied relief because Houston failed to present evidence demonstrating that a conflict adversely affected counsel’s performance.
B
The Supreme Court has held that a criminal defendant has a constitutional right to assistance of conflict-free counsel. Strickland v. Washington, 466 U.S. 668, 688, 104 S.Ct. 2052, 80 L.Ed.2d 674 (1984). Where the conflict stems from counsel’s representation of multiple defendants, the petitioner “must establish that an actual conflict of interest adversely affected his lawyer’s performance.” Cuyler v. Sullivan, 446 U.S. 335, 350, 100 S.Ct. 1708, 64 L.Ed.2d 333 (1980). The Supreme Court has defined an “actual conflict” by the effect a potential conflict had on counsel’s performance. Mickens v. Taylor, 535 U.S. 162, 171, 122 S.Ct. 1237, 152 L.Ed.2d 291 (2002).
Where defense counsel timely points out a conflict of interest in joint representation, the trial court is required to investigate further; ignoring counsel’s objection mandates automatic reversal of the resulting conviction. See Holloway v. Arkansas, 435 U.S. 475, 488, 98 S.Ct. 1173, 55 L.Ed.2d 426 (1978). Conflicts can also arise from successive representation, particularly when a substantial relationship exists between the cases, such that the “factual contexts of the two representations are similar or related.” Trone v. Smith, 621 F.2d 994, 998 (9th Cir.1980); see also Fitzpatrick v. McCormick, 869 F.2d 1247, 1252 (9th Cir.1989). The Supreme Court, however, has left open the question whether conflicts in successive representation that affect an attorney’s performance require a showing of prejudice for reversal. See Mickens, 535 U.S. at 176, 122 S.Ct. 1237.
In this case, after Chadwick waived his attorney-client privilege, the trial judge concluded that no conflict existed, without ever inquiring into the impact the prior representation may have had on Houston or on Jorgenson’s performance. Indeed, the judge saw “no conflict here whatsoever” and failed to see “how Mr. Houston has a right to waive anything.” Because any conflict that existed was Houston’s either to waive or to assert, the trial judge’s exclusive focus on Chadwick was misplaced, rendering the conflict inquiry inadequate. See Lockhart v. Terhune, 250 F.3d 1223, 1232-1233 (9th Cir.2001). Similarly, the Nevada Supreme Court failed to reach the issue of whether Jorgenson acted adversely to his current client, or whether his performance prejudiced Houston.
*1082The limited record before us reveals that Jorgenson expressed concern over jeopardizing Chadwick’s parole status, stated his belief that Chadwick had been wrongfully convicted in a case related to the ongoing feud at issue in Houston’s case, and told the judge that his “heart is going to be with Mr. Chadwick.” On these facts, the trial judge should have conducted a more complete evidentiary hearing on the potential conflict. As it now stands, the record is insufficient for us to determine whether an actual conflict of interest existed, or whether Jorgenson labored under a perceived conflict and limited his cross examination of Chadwick as a result.
C
The proceedings in Alberni v. McDaniel, 458 F.3d 860 (9th Cir.2006), cert. denied, — U.S. -, 127 S.Ct. 1834, 167 L.Ed.2d 333 (2007) are instructive. In that case, public defender Buchanan represented the victim-witness, Flamm, prior to representing Alberni. Id. at 867-68. The earlier case involved a drug exchange between Flamm and Alberni that led to hostilities, later resulting in the shooting of another man. Id. Buchanan defended Al-berni against charges that he murdered this other man and Flamm was called as an eyewitness to the altercation. Id. Counsel told the judge he felt conflicted by the prior representation and therefore unable to cross examine his former client. Id. at 868. The judge obtained a waiver of the attorney-client privilege from Flamm, but not from Alberni. Id. at 868-69. During trial, Buchanan failed to impeach Flamm through his prior conviction and parole status, among other things. Id. at 869, 872. Because the record was incomplete, we remanded for an evidentiary hearing to determine whether the attorney’s performance was adversely affected by the prior representation. Id. at 872-73.
Houston argues that Chadwick’s prior conviction, parole status and failed polygraph exam were available to Jorgenson to impeach Chadwick’s credibility, but that Jorgenson chose not to use them. As support, Houston offers a number of examples in which similar evidence was admitted through various exceptions to Nevada’s evidentiary rules. The state insists, and the dissent would agree, that such evidence was inadmissable under Nevada law, so Jorgenson could not have used this information during Chadwick’s cross examination.3 But, as we have already stated, Chadwick’s credibility was a particularly important aspect of the case and certainly central to Houston’s defense. We are mindful not to speculate about Jorgenson’s trial strategy, nor whether the trial judge would have admitted the impeachment evidence in this case. What is important is whether Jorgenson modified his representation of Houston in a way that adversely affected his performance, see id. at 871; Lockhart, 250 F.3d at 1231, and whether this effect prejudiced Houston; i.e., whether there is “a reasonable probability that, but for counsel’s unprofessional errors, the result of the proceeding would have been different.” Strickland, 466 U.S. at 694, 104 S.Ct. 2052. On the incomplete record before us, we cannot make that determination.
*1083An evidentiary hearing is needed to resolve these factual issues. AED-PA allows for an evidentiary hearing when a petitioner (1) alleges facts, which, if proven, would entitle him to relief; and (2) shows that he did not receive a full and fair hearing in the state court. See 28 U.S.C. § 2254(e)(2); Alberni, 458 F.3d at 873. Houston has alleged facts suggesting the existence of a conflict of interest and the prejudicial effect of Jorgenson’s adverse performance, which, if proven, would entitle him to relief under Strickland. The trial court failed to fully investigate Jorgenson’s perceived conflict and no state court has held a full and fair hearing on this serious conflict allegation. As a result, the Nevada Supreme Court’s conclusion that no actual conflict existed is based on an incomplete record, devoid of sworn testimony explaining Jorgenson’s tactical reasons, if any, for not attempting to vigorously impeach Chadwick with his parole status or failed polygraph exam. Similarly, the district court prematurely determined that Jorgenson’s performance was not adversely affected by a conflict, without hearing from Jorgenson on the matter.
We are cognizant of the potential increase in litigation arising from the imputation of one attorney’s conflict to an entire public defender’s office. However, the facts of this case are unique and, therefore, unlikely to open any floodgates of imputed conflict claims. This is particularly true because this case concerns a longstanding feud between Houston and Chadwick and the prior representation at issue here was the direct result of that “bad blood.” We are confident that allowing further exploration of the fact that Jorgenson subjectively felt conflicted and expressed this to the judge will not create a broad rule of imputed disqualification.4
We therefore reverse the portion of the district court’s decision pertaining to the conflict of interest and remand with instructions to conduct an evidentiary hearing to determine whether a conflict of interest adversely affected counsel’s performance and, if so, whether there is a reasonable probability that the result of the trial would have been different in the absence of that effect. See Strickland, 466 U.S. at 694, 104 S.Ct. 2052; Alberni, 458 F.3d at 874. We affirm the remainder of the district court’s judgment.
AFFIRMED IN PART, VACATED AND REMANDED FOR AN EVIDEN-TIARY HEARING. Each party shall bear their own costs.
. It is not clear from the record whether Chadwick was convicted of shooting into Houston’s house, but Jorgenson's representa-lions, as an officer of the court, suggest that Houston was the intended victim.
. Because Chadwick’s earlier prosecution and Houston’s case involved many of the same parties and resulted from an ongoing feud between the families, we respectfully disagree with the Nevada Supreme Court’s determination that the cases "did not involve the same facts.” See Trone v. Smith, 621 F.2d 994, 998 (9th Cir.1980) ("Substantiality is present if the factual contexts of the two representations are similar or related.”); see also Fitzpatrick v. McCormick, 869 F.2d 1247, 1252 (9th Cir.1989).
. While not determinative, it is worth noting that after the evidentiary hearing in Albemi, the district court concluded that an actual conflict existed. The district court reasoned that counsel's failure to impeach the victim-witness (through means very similar to those available in Houston's case and governed by the same Nevada evidentiary rules) evidenced that Alberni's attorney curtailed his performance because of a perceived conflict. See also Lewis v. Mayle, 391 F.3d 989, 997-1000 (9th Cir.2004) (holding that counsel’s failure to impeach former client-witness with prior conviction and probation status amounted to actual conflict adversely affecting representation).
. While the dissent correctly points out that neither party formally requested an evidentia-ry hearing, Houston raised the need for such a hearing during oral arguments. Moreover, we have previously remanded for an eviden-tiary hearing sua sponte “to assist the court in making an accurate determination.” See Butler v. Curry, 528 F.3d 624, 651 (9th Cir.2008).
We see a legitimate need for further fact-finding in this case before an accurate determination of the issues can be made. Houston suggested that Jorgenson failed to “fully disclose what more he might know about this case,” and even counsel for respondent admitted that it is "possible that he had some knowledge” about Chadwick's prior case. During oral arguments, when asked why Jor-genson expressed sympathy for Chadwick, counsel for respondent replied "I don't have a clear record on that” and agreed that it was "odd.” These speculative responses, combined with the inadequate and confused questioning by the state court, convince us that further development of the record is required.