hoda kotb: his name, kenneth williams.shots with the walgreens video. and you think, boom, we've got our guy. i think it's probably him, but there again, the picture on the video's not real good. but i start focusing in on him at that point. hoda kotb: then rick's investigation got lucky again. an unlikely witness came forward with information about that same kenneth williams and the night erica and her mom were shot. but the witness, rashon turner, was questionable. he was charged with murder himself, for which he'd later plead guilty to manslaughter. and he was also gravely wounded in a shooting. prosecutor john heck. john heck: he's on his deathbed, he thinks he's going to hell, and he has something he needs to say. hoda kotb: weeks later, turner's health improved enough to talk to rick arnold. james and kenneth williams. they had supposedly hit a lick on a woman. they hit a lick on some lady. what does that mean? that's slang term for a robbery. hoda kotb: robbery that quickly escalated to murder. he knew things he cou