maybe it was the fact that he still seemed unusually bound to a woman he called his ex-wife. from the very beginning, deanna says, keith told her that he was divorced. >> very first conversation. >> i'm a divorced guy. >> right. >> by the time she was sitting across from detective carter in that interview room, deanna says she and keith had never been intimate, but they were dating. and keith was talking long-term. house-hunting for them. >> he said, i don't want to scare you, but i want you to know that i'm looking for properties here in morrisville to buy, so -- for us to be together. >> for the detective, deanna's story put a whole new spin on the investigation. keith griffith now seemed like a man with a very big secret. or thinking like a homicide detective, was she the one with the secret? >> you can spin it another way and say maybe she's driving events here. maybe she wants to get rid of the wife. >> that's correct. we were open for that being an