larry beaumont: we couldn't find anything. doesn't mean it wasn't there. ont decided to try something completely different. larry beaumont: i came up with the idea of putting somebody in the prison cell with him to see if we can get him to tell us what he did with tricia reitler. they all think you're crazy? most people did think i was crazy, yeah. but i was able to convince them that we should do it anyway. lester holt: enter jimmy keene, the drug dealer beaumont had just convicted and sent to a low security prison. why did he stick out in your mind? because i knew he was kind of a con man. he was smart. i knew if anybody could pull it off, he would probably be the one to able to pull it off. he says, you've been trained in martial art. he goes, you can go into a dangerous environment where a lot of people can't. and you can maintain and protect yourself in an environment like that. lester holt: in return, beaumont offered jimmy freedom. but first, jimmy would have to exact more than a confession. i told him, unless we found the body, he would get no credi