*110 The petitioner, Michael Holbrook, appeals from the judgment of the habeas court denying his amended petition for a writ of habeas corpus. On appeal, the petitioner claims that the court improperly concluded that he failed to prove (1) ineffective assistance of his prior habeas counsel, and (2) that the state suppressed exculpatory evidence at his criminal trial in violation of Brady v. Maryland , 373 U.S. 83 , 87, 83 S.Ct. 1194 , 10 L.Ed.2d 215 (1963). 1 We affirm the judgment of the habeas court.

The following facts and procedural history surrounding the petitioner's conviction were set forth by *111 this court in our decision on direct appeal affirming the petitioner's conviction: "John Fred Dean was shot and killed inside a Bridgeport nightclub known as the Factory. The state charged the [petitioner] ... with Dean's murder. In 2003, the [petitioner's] first jury trial ended in a mistrial. After a second trial, in 2004, the jury found the [petitioner] not guilty of murder but found him guilty of the lesser included offense of manslaughter in the first degree with a firearm in violation of General Statutes § 53a-55a (a). The jury also made a finding that the [petitioner] had committed a class A, B or C felony with a firearm in violation *249 of General Statutes § 53-202k. The trial court rendered judgment in accordance with the verdict and sentenced the [petitioner] to a total effective term of thirty-five years incarceration." State v. Holbrook , 97 Conn. App. 490 , 492, 906 A.2d 4 , cert. denied, 280 Conn. 935 , 909 A.2d 962 (2006).

In June, 2007, the petitioner filed a petition for a writ of habeas corpus, which was denied by the court, T. Santos, J. , following a trial. On appeal, this court affirmed the denial of the petition. Holbrook v. Commissioner of Correction , 149 Conn. App. 901 , 87 A.3d 631 , cert. denied, 311 Conn. 952 , 91 A.3d 464 (2014).

In June, 2014, the petitioner, who was then self-represented, filed a petition for a writ of habeas corpus. Thereafter, represented by counsel, the petitioner filed an amended petition alleging ineffective assistance of his trial counsel, Attorney Frank J. Riccio, for declining to call Cherise Thomas as a witness; ineffective assistance of prior habeas counsel, Attorney Michael Day, for failing to pursue a claim that trial counsel was ineffective for failing to call Thomas as a witness; and the failure of the state to produce exculpatory information to the petitioner. The court, Hon. John F. Mulcahy, Jr. , judge trial referee, denied the petition. The court thereafter granted the petition for certification to appeal. This appeal followed.

*112 I

The petitioner claims that the court erred in concluding that Day did not render ineffective assistance for declining in the prior habeas proceeding to pursue a claim that Riccio was ineffective for failing to call Thomas as a witness in the underlying criminal trial. We do not agree.

"It is well established that [a] criminal defendant is constitutionally entitled to adequate and effective assistance of counsel at all critical stages of criminal proceedings .... This right arises under the sixth and fourteenth amendments to the United States constitution and article first, § 8, of the Connecticut constitution .... As enunciated in Strickland v. Washington , [ 466 U.S. 668 , 687, 104 S.Ct. 2052 , 80 L.Ed.2d 674 (1984) ] ... [a] claim of ineffective assistance of counsel consists of two components: a performance prong and a prejudice prong. To satisfy the performance prong ... the petitioner must demonstrate that his attorney's representation was not reasonably competent or within the range of competence displayed by lawyers with ordinary training and skill in the criminal law .... An ineffective assistance of counsel claim will succeed only if both prongs [of Strickland ] are satisfied." (Citations omitted; internal quotation marks omitted.) Sanders v. Commissioner of Correction , 169 Conn. App. 813 , 823, 153 A.3d 8 (2016), cert. denied, 325 Conn. 904 , 156 A.3d 536 (2017).

"[When] applied to a claim of ineffective assistance of prior habeas counsel, the Strickland standard requires the petitioner to demonstrate that his prior habeas counsel's performance was ineffective and that this ineffectiveness prejudiced the petitioner's prior habeas proceeding .... Therefore, as explained by our Supreme Court in Lozada v. Warden , 223 Conn. 834 , 613 A.2d 818 (1992), a petitioner claiming ineffective *113 assistance of habeas counsel on the basis of ineffective assistance of [trial] counsel must essentially satisfy Strickland twice: he must prove both (1) that his appointed habeas counsel was ineffective, and (2) that his [trial] counsel was ineffective .... We have characterized this burden as presenting a herculean task ...." (Citations omitted; internal quotation marks omitted.) *250 Mukhtaar v. Commissioner of Correction , 158 Conn. App. 431 , 438-39, 119 A.3d 607 (2015).

The habeas court noted that Day, "in an abundance of caution," included twenty-seven claims in his habeas petition, but upon further analysis pursued only six of the listed claims, which did not include the claim of ineffective assistance of trial counsel for failure to call Thomas as a witness. The habeas court concluded that Day's procedure of "exercising professional judgment ... in winnowing down from the long list of claims initially thought to be possibly viable" did not constitute deficient performance. We will not disturb the court's finding that Day's decision not to pursue the claim at issue was a reasonable strategic decision. "[A] reviewing court is required not simply to give [the trial attorney] the benefit of the doubt ... but to affirmatively entertain the range of possible reasons ... counsel may have had for proceeding as [he] did .... [S]trategic choices made after thorough investigation of law and facts relevant to plausible options are virtually unchallengeable ...." (Citation omitted; internal quotation marks omitted.) Michael T. v. Commissioner of Correction , 319 Conn. 623 , 632-33, 126 A.3d 558 (2015). Additionally, "the failure to pursue unmeritorious claims cannot be considered conduct falling below the level of reasonably competent representation." (Internal quotation marks omitted.) Tillman v. Commissioner of Correction , 54 Conn. App. 749 , 756-57, 738 A.2d 208 , cert. denied, 251 Conn. 913 , 739 A.2d 1250 (1999).

*114 The court further found that Strickland 's prejudice prong was not satisfied because, "based on the previous analysis of trial counsel's tactical decision regarding the Thomas statements," a reasonable probability did not exist that the result of the first habeas trial would have been different had Day pursued the claim that Riccio was ineffective for failing to call Thomas as a witness. In analyzing the merits of the underlying claim of ineffective assistance of trial counsel, the court concluded that Riccio, who had represented the petitioner in both criminal trials and who had died before the petitioner brought his second petition for a writ of habeas corpus, was "seasoned," and was an "exceedingly experienced, skilled and proficient criminal defense attorney." 2

The court concluded that Riccio's strategic decision not to call Thomas to testify at the second criminal trial did not constitute deficient performance. Thomas was impeachable by virtue of her prior personal connection with the petitioner, whom she had known for years. Thomas gave two statements on different dates to the police, recounting the events that occurred at the Factory nightclub on the night of the shooting. Both statements were admitted as full exhibits at the second *115 habeas trial. The second habeas court found that *251 the two statements that Thomas had given to the police on separate dates were inconsistent. In the first statement, Thomas said there had been a fight and that the petitioner indicated that he had been "hit," but in her second statement she denied that a fight occurred and did not remember the petitioner stating that he had been hit. The court concluded that Thomas' first statement to the police that the petitioner had told her that he had been hit might "lend support" to the state's position that the petitioner had been involved in a physical fight with the victim, Dean, which precipitated the shooting that caused Dean's death. The court concluded that Riccio, who had been present during both of Thomas' statements to the police, inferentially made a "presumptively prudential decision" on whether to use Thomas' second statement that could have led to further impeachment evidence as to Thomas.

The court noted that Riccio's trial strategy in not calling Thomas to the witness stand was influenced by the fact that the state's witnesses brought considerable " 'baggage' " in terms of prior criminal histories, inconsistent statements, losses of memory and recantations, and that where those witnesses recanted or professed some loss of memory their prior written signed statements were admitted for substantive purposes under authority of State v. Whelan, 200 Conn. 743 , 753, 513 A.2d 86 , cert. denied, 479 U.S. 994 , 107 S.Ct. 597 , 93 L.Ed.2d 598 (1986). In his summation to the jury, Riccio pointed out the inconsistencies in the testimony of the state's witnesses. Riccio testified in the first habeas trial that "I've never seen it [ Whelan ] used as much as it was in this particular case." The second habeas court stated in its decision: "An offer and admission of the Thomas statements by the defense would introduce yet another (in the court's view, material) inconsistency, resulting quite likely in another Whelan admission, this *116 time involving a defense witness. Such would render less persuasive a defense argument in summation that the state's witnesses were all over the place, could not remember, and were inconsistent."

The court concluded that Riccio, who had heard and observed Thomas at the time of her statements, made a strategic decision not to have Thomas testify that "should not now be second-guessed." Michael T. v. Commissioner of Correction , supra, 319 Conn. at 632-33 , 126 A.3d 558 . As we have noted previously, reasonable strategic choices made after a thorough investigation are virtually unchallengeable. Id. After a careful review of the record, we conclude that the habeas court properly determined that the petitioner had failed to prove his claim of ineffective assistance of habeas counsel.

II

We next turn to the petitioner's claim that the court improperly rejected his claim that the prosecution suppressed evidence favorable to him in violation of Brady v. Maryland , supra, 373 U.S. 83 , 83 S.Ct. 1194 . Specifically, the petitioner claims that the prosecution failed to disclose that it had declined to make any plea offers to Gary Browning, an eyewitness who testified for the state, regarding his charges of robbery until he testified in the petitioner's 2004 criminal trial. We disagree.

"Due process principles require the prosecution to disclose to the defense evidence that is favorable to the defendant and material to his guilt or punishment .... In order to obtain a new trial for improper suppression of evidence, the petitioner must establish three essential components: (1) that the evidence was favorable to the accused; (2) that the evidence was suppressed by the state-either inadvertently *252 or wilfully; and (3) that the evidence was material to the case, i.e., that the accused was prejudiced by the lack of disclosure .... *117 "The state's failure to disclose an agreement with a cooperating witness may be deemed to be the withholding of exculpatory evidence. Impeachment evidence falls within Brady 's definition of evidence favorable to an accused .... Impeachment evidence is broadly defined in this context as evidence that could potentially alter the jury's assessment of a witness' credibility .... Specifically, we have noted that [a] plea agreement between the state and a key witness is impeachment evidence falling within the ... Brady doctrine." (Citations omitted; internal quotation marks omitted.) Marquez v. Commissioner of Correction , 330 Conn. 575 , 592, 198 A.3d 562 (2019). "Any ... understanding or agreement between any state's witness and the state police or the state's attorney clearly falls within the ambit of Brady principles." (Internal quotation marks omitted.) Elsey v. Commissioner of Correction, 126 Conn. App. 144 , 152-53, 10 A.3d 578 , cert. denied, 300 Conn. 922 , 14 A.3d 1007 (2011). "[A]n unexpressed intention of the state not to prosecute a witness does not fall within the ambit of the Brady principles concerning disclosure by the prosecution of evidence favorable to an accused." (Internal quotation marks omitted.) State v. Rucker , 177 Conn. 370 , 376, 418 A.2d 55 (1979).

"The question of whether there existed an agreement between [a witness] and the state is a question of fact .... When reviewing the decision of a habeas court, the facts found by the habeas court may not be disturbed unless the findings were clearly erroneous." (Internal quotation marks omitted.) Lewis v. Commissioner of Correction , 116 Conn. App. 400 , 407, 975 A.2d 740 , cert. denied, 294 Conn. 908 , 982 A.2d 1082 (2009). "Furthermore, the burden is on the defendant to prove the existence of undisclosed exculpatory evidence." State v. Floyd , 253 Conn. 700 , 737, 756 A.2d 799 (2000). "Whether the petitioner was deprived of his due process rights due to a Brady violation is a question of law, to which we grant plenary review." (Internal quotation marks omitted.)

*118 Peeler v. Commissioner of Correction , 170 Conn. App. 654 , 689, 155 A.3d 772 , cert. denied, 325 Conn. 901 , 157 A.3d 1146 (2017).

The petitioner contends that the prosecution delayed making a plea offer to Browning until after Browning testified in the petitioner's 2004 criminal trial. This claim rests on a very slender reed. The first habeas court found Browning not to be a credible witness, and he did not testify before the second habeas court. The only evidence of the allegation of a delayed plea offer is in a statement by Browning made in the first habeas trial in which he stated: "No, they wouldn't give me an offer until after I testified." The habeas court made no finding that the prosecution had made any statement to that effect, and the petitioner's claim is not distinctly raised in his habeas petition. At oral argument before this court, the Brady claim morphed into a claim that the state had waited to make a plea offer to Browning, the cooperating witness, until after he gave testimony. However, not only is there nothing in the petition that raises this claim distinctly, there is no finding by the habeas court that the prosecution ever told Browning that an offer of a sentence would be made in return for his guilty plea, but not until after his testimony. The petitioner's counsel conceded at oral argument that there is no authority for the proposition urged by the petitioner that the state is under an obligation to make a plea offer to a witness who is himself facing criminal charges before *253 he gives testimony in a case. Here, the court made a finding that "the petitioner has failed to present any credible evidence that there was an actual or implied agreement between the state and Gary Browning that the state failed to disclose." The petitioner's claim of a Brady violation is without merit.

The judgment is affirmed.

In this opinion the other judges concurred.