anna moses wasn't even cold and in the ground by the time robert moses moved back into the house. at the investigation, who -- who's benefitting from anna's death? >> reporter: investigators were smelling the oldest of motives. >> it was all about the money. >> you think bob moses essentially killed his wife by mistakenly thinking that he was gonna get a pot of gold at the end of the rainbow? >> it was a targeted murder. either he was gonna be the beneficiary or he could manipulate igor, to get access to that money. >> reporter: and now, cops were eager to confront the man with a motive. they went in for the kill. >> we either think we're sitting across from a monster or somebody that had a lapse in judgment. >> me? no. absolutely not. >> why not, bob? >> okay. i don't know what you're talking about now, but it sounds like you're accusing me of something. >> we're -- we're fact-finders, okay? >> good. i hope you find the facts. >> you're making it hard for me to find the facts, bob, because you can't tell me [ bleep ]. >> you know what? i'm done -- i'm done talking to you guys. i'm