Did the failure to introduce evidence that the pedestrian had cocaine in her system render counsel's assistance constitutionally ineffective?

QUESTION PRESENTED Philip Rogers was driving after several drinks. Ahead of him a woman was jaywalking, possibly obscured by two bicyclists also crossing. When he saw the woman he tried to avoid her. But she stepped back into the path of the car, which fatally struck her. Though Rogers’s defense counsel learned that the pedestrian had cocaine in her system, he failed to introduce that fact at trial to prove that her conduct was unforeseeable. Did this failure render counsel’s assistance constitutionally ineffective?