had been married seven times. number six, a woman named nancy graham, lived in alabama. velasquez called her. >> i told her, i'm investigating the disappearance to have david jackson. and she said to me, how much evidence do you have against him? and i said, i can't discuss the evidence with you, but i can tell you that it's enough for me to put him away right now. i was just totally bluffing. i had really, nothing. i'm just throwing it out there, you know, fishing that long line and if something bites, i'm reeling it in. and she says, honey, she says, let me call you back. >> the minutes ticked by, velasquez waited by the phone.