months later, d.a. lewin the prison about bill bradford. >> they tell me that his cellmate has come forward. and he has said that bradford is very angry at you, and he is talking about making plans to murder you and your family. >> of course in lewin's line of work idle threats from resentful jailbirds were not exactly new. but this bill bradford guy caught his attention. he seemed as cold-blooded as they come. so lewin went to talk to the informant. >> normally, if somebody comes to you with a story like that, they want a little time off their sentence or something. >> they want something, absolutely. so -- >> not this guy? >> nothing. one of the first thing i asked is why are you coming forward? and he said, "um, i hate the guy. i couldn't believe how he would talk about his wife and how he killed her." and he said, "now he's talking about killing somebody else's family, and i just couldn't stay quiet." >> lewin polygraphed the informant. he passed. and then added a warning. >> that bradford had said that h