michael roberts persuaded his wife, tracey, to go on "the montel williams show," a last, desperate appealit was taking it to a more national level, that someone could come forward, and it could be a lead. we believe that there's somebody that still knows something. and so we're appealing to-- we're appealing to people, if they know something, to call. dennis murphy (voiceover): on television, with their hands clasped, michael and tracey looked like a team. but inside, tracey says, she'd been starting to have her doubts. someone called, and they very kind of snidely said to me, oh, did your husband tell you he failed his polygraph? dennis murphy (voiceover): flunked a lie detector? tracey says she assumed there must be some kind of explanation and waited for michael to tell her about the results himself. we get into bed. i'm expecting this is when we're going to talk, right? he rolls over and goes to sleep. and i'm laying in bed like, what's going on here? dennis murphy (voiceover): tracey thought how little she really knew about her second husband and what he was capable of. they'd met on