Was defense counsel ineffective in the re-trial when he failed to object to the introduction of the tainted testimony from the first trial and when he failed to introduce testimony from the same witnesses in a post-conviction hearing that seriously impeached the trial testimony?

QUESTIONS PRESENTED After Petitioner was convicted of robbery and murder, the state court decided that Defense counsel’s cross-examination of two critical witnesses was ineffective and vacated the convictions and sentence. Was defense counsel ineffective in the re-trial when he failed to object to the introduction of the tainted testimony from the first trial and when he failed to introduce testimony from the same witnesses in a postconviction hearing that seriously impeached the trial testimony? i