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Woods. >> he admitted to you he buried her in the woods? >> several times he admitted that, yes. >> i basically made him feel like it was okay to tell me his secret. >> but keene still needed the secret that would set him free. the exact location of tricia's body. weeks later, he thought he nailed it when he found hall hovered over a map in the prison workshop. >> it was a map with red dots over indiana, illinois and wisconsin and he covered it up really fast. >> lined up at the edge of the map were a dozen wooden falcons. >> i said, wow, this is pretty cool, did you make these? he said, yeah,...

Dead, and a map mark with dots. it was the information keene thought would surely lead to the exact location of tricia's body. >> and that moment did you think, this is my ticket to freedom? >> i did. because i thought this is it. i've got solid confessions out of him. we know specific details. we know how he's done it now. >> keene believed he had his answer. he'd soon be free. that he was done forever with larry hall. so that night, at lockdown, keene decided to tell hall what he really thought. >> i told him he was a [bleep]ing sicko. that he was insane. you're one of the most despicable fo...

unsolved. officials believed only one man knew what happened. >> we knew he was responsible for several deaths. >> and to get answers it would take a risky, unusual plan. send a convicted drug dealer undercover into a dangerous prison to befriend and alleged serial killer. >> i'm not a serial killer hunter. i said, how am i going to do this? >> at stake, answers. >> wondering where she is. what happened. >> peace for grieving families. >> you want to find her and bring her home and you can't. >> and one man's freedom. >> you don't just turn around and give out candy and say, you're f...

unsolved. officials believed only one man knew what happened. >> we knew he was responsible for several deaths. >> and to get answers it would take a risky, unusual plan. send a convicted drug dealer undercover into a dangerous prison to befriend and alleged serial killer. >> i'm not a serial killer hunter. i said, how am i going to do this? >> at stake, answers. >> wondering where she is. what happened. >> peace for grieving families. >> you want to find her and bring her home and you can't. >> and one man's freedom. >> you don't just turn around and give out candy and say, you're f...