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, someone gave her date rape drug? >> that's a possibility. >> m.e. also finds semen? >> correct. >> reporter: 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've been finding out the past two days everything she's been telling me in therapy all these years has been a lie. >> coming up, the nique no one knew. stories of unstable behavior.