. >> reporter: we're finding out what led gwinnett county police to charge a husband in the murder of his wife three and a half years ago. >> reporter: our affiliate wsb went straight to nique's sister amy and showed her this video of her nemesis in custody. >> it's a thing i've kind of pictured in my mind for a while but kind of had doubts as to whether i would actually ever see it. >> reporter: matt leili can forget about spending the insurance money. now he's fighting to keep from spending the rest of his life in a georgia prison. >> you have been charged with murder. >> reporter: matthew leili appeared tired and dazed as a judge read him the charges. >> reporter: dazed, maybe, but not confused. from behind bars awaiting trial, these recordings obtained by "20/20" reveal leili has an audacious plan to spring himself. >> make sure you tell people we have set up a youtube channel. to tell you the truth about what happened in our home. >> okay. >> reporter: his secret weapon? his own daughters, amanda and rebecca. they get father-knows-best instructions from a jailhouse phone calls to

. >> gwinnett county police detective brad everson. >> no clothing whatsoever. >> any obvious injurieso the body? lacerations? blunt force trauma, gunshot, stab wound? anything you could see? >> nothing. and of course at this point, there's no -- there is no identifying documents around it. so there's nothing around where the body is at that would indicate what happened. >> in the way of these things, dental records confirmed what everyone suspected. the body in the woods was indeed that of nique leili. >> a telling factor was the bottoms of her feet were clean. >> what does that tell you? connect the dots for me. >> that tells you she didn't walk out there and put herself in those woods, and she sure wasn't going to cover herself up. >> later, lab analysis of nique's blood revealed something else that was odd. there was a high level of the date rape drug ghb in her system. so now you're thinking maybe sometime before this woman's death, almost immediately before, somebody gave her the date rain drug? >> that's a possibility. >> m.e. also finds semen. >> correct. >> had nique somehow b