>> the body of rachael anderson. >> reporter: into the fast moving river, never to be seen again.d the jury make of this man giving them such critical evidence? the play-by-play of the crime itself? you know they're going to hate this guy. >> that's the reality of the case. >> reporter: did it matter whether the jury sat in moral judgment of your star witness, mia? >> no. they won't like that he didn't intervene and that he helped dispose of her body, but that doesn't change the fact that he witnessed what he did. >> reporter: as the state rested, it looked ironically as though its star witness would prove to be the best thing the defense had going for it. david stone. would the jury believe a word he said? >>> coming up -- the other man at the center of this case. charles capone takes the tough questions from us. >> reporter: this whole thread of this thing, i'll kill your wife if you'll kill mine, did that happen? >> when "dateline" continues. this week on "the upper hands"... special guest flo challenges the hand models to show off the ease of comparing rates with progressive's