up. >> who is setting you up? >> i'm so [ bleep ] stupid. >> reporter: prosecutor breton didn't believe weldon had been framed exactly. but "set up?" in a way, yes. remember those horrible allegations of abuse diana made against greg, that he'd molested her and their son? breton believes diana fabricated them. >> all the therapists, the physicians, everyone that was involved, made the determination that there was no truth to it. and when the court system didn't believe her, then she decided to come up with the way to have him killed. >> reporter: and the prosecutor said that's where weldon came in. a self-styled protector, a man primed to react to the exact type of allegations diana was making. >> oh, god. stop. >> reporter: remember what weldon said on "dateline" when he heard crystal harris' recording of her husband's abuse? >> i really wanted to go and kill him. >> reporter: the prosecutor