>> had nique somehow been abducted, raped, and then dumped less than a mile from her home? the detective couldn't say. but in the days before her body was found, while this was still a missing person's case, nique's husband matt had told everson something intriguing on the phone. this wasn't the first time nique leili had walked out on him. >> my wife has a long history of some kind of mental imbalances, okay. and i have been finding out the past two days everything she has been telling me in therapy all these years has been a lie. >> coming up -- the nique no one knew. stories of unstable behavior. >> my father is a witness for her throwing a knife at my face. >> when "dateline" continues.