reporter: daniel willyam, as was his right, declined to testify when he went on trial for killing shelley nance. so he did not himself point at nathan and accuse him of committing the murder. but of course he didn't have to. his attorney did it for him. it was not a surprise to prosecutor dewey mitchell. >> they said it could've been nathan, and it could've been a random person, and that by the time the state's done with its case, you're not gonna be able to know who did this crime. they just don't have evidence. i think it was a pretty good strategy. >> reporter: yeah. >> i think it was the only strategy. you know, this wasn't a self-defense case and it wasn't an insanity case. so it had to be somebody else. >> reporter: well, it makes sense. i mean, again, did you have blood? no. do you have dna? no. >> what they had in their pocket, my star witness is, is the boyfriend who we -- we knew the girlfriend was thinking