a horrendous crime to lose your daughter and never find out what the heck happened to her. >> larry beaumontarrangements on a couple of occasions to go out and look for the body. >> beaumont called in specialized military and law enforcement units to search. >> we were not able to find it. so rather than give up, it occurred to me that obviously, larry hall knew. >> beaumont needed answers and turned to an unlikely source to get them. he needed someone to befriend larry hall. someone charismatic, someone on the inside. larry beaumont needed jimmy keene. he had sent both keene and hall to prison. now he hatched a risky plan that would bring them together. keene was ten months into his sentence when beaumont brought him into talk. >> scared me. i thought it was a trick. >> keene watched nervously as beaumont pushed a folder across the table. >> and i open it up and the first thing i seen was a picture of a mutilated dead girl. and i flipped the next page and there was a different mutilated dead girl. >> and there was a portrait of tricia reitler. >> at that moment i looked up at him and he sai

a horrendous crime to lose your daughter and never find out what the heck happened to her. >> larry beaumont kept looking, too. >> i actually made arrangements on a couple of occasions to go out and look for the body. >> beaumont called in specialized military and law enforcement units to search. >> we were not able to find it. so rather than give up, it occurred to me that, obviously, larry hall knew. >> beaumont needed answers and turned to an unlikely source to get them. he needed someone to befriend larry hall. someone charismatic, someone on the inside. larry beaumont needed jimmy keene. beaumont had sent both keene and hall to prison. now he hatched a risky plan that would bring them together. keene was ten months into his sentence when beaumont brought him in to talk. >> scared me. i thought this was some trick. >> keene watched nervously as beaumont pushed a folder across the table. >> and i open it up and the first thing i seen was a picture of a mutilated dead girl. and i flipped the next page and there was a different mutilated dead girl. >> and there was a portrait of tricia reit

we need you to help us with his case. >> reporter: beaumont wanted him to go under cover to a dangerous prison and to befriend alleged serial killer larryy keene about what it was like to go under cover in prison. >> you're supposed to get some information from this man by the name of larry hall. he's the alleged serial killer. he's in prison on a federal kidnapping charge. what specifically, what information are you supposed to get from him? >> the main thing was to try to find the bodies. the next thing was to get specific con dpegs fessions abo he did it, why he did it, what prompted him, what girls and so fort. >> and again, it's alleged. he's only in prison for a kidnapping charge. but there's a belief by many in law enforcement that he could be connected to many young girls' deaths in indiana and elsewhere. so here you go, you go into this maximum security prison, you're under cover. what was your worst fear, jimmy. you were risking your life to do this. >> well, sure. obviously i think your worst fear is that anybody, other inmates would find out that you were working with the government. and if they did, they may feel it was som

. >> reporter: jimmy keen was ten months into his sentence when larry beaumont brought him in to talkht this was some trip. >> reporter: keen watched nervously as beaumont pushed a folder across the table. >> i looked and there was a mutilated dead girl. i flipped the page and there was another mutilated dead girl. i looked up and he said, we need you to help us with this case. >> he went from his low security lockup to a dangerous prison and to prefriend larry hall. >> he said if you can get solid confessions from him and you can help us locate the bodies that are still missing, we're willing to completely wash your record. >> reporter: keane's mission, to learn where patricia rightler was buried. beaumont made it clear, no body, no early release. keene would have to serve the rest of his ten-year sentence. >> he's smart, articulate, he's not afraid, and i knew he wanted to get out. >> reporter: for keene it was a chance for redemption, to restore his family name. and to get his life back on track. >> this was a way for him to get home, and a way for him to do good. to kind of take t

. >> beaumonted wanted keen to go under cover, to transfer from his low security lockup to a dangerous prison and to be friend alleged serial killer larryeen's mission? to learn where trisha reikler was buried. >> the purpose of this operation was to find that body. >> beaumont made it clear, no body, no early release. keen would have to serve the rest of his ten-year sentence. but beaumont believed keen could do it. >> he's smart. he's articulate. he's not afraid. and i knew he wanted to get out. >> for keen, it was a chance for redemption, to restore his family name and, says author hillel levin, to get his life back on track. >> this deal was a way for him to get home, to take this bad thing he had done and to somehow turn it inside out and make it something that would solve a crime. >> but it wouldn't be easy. fair to say, he was risking his life. he could have been killed. >> it was dangerous, absolutely. >> it was highly risky. these people in those type of places haven't got anything better to do than to try and hurt you and kill you, too. >> keen was unsure, but a phone call home put his doubts to rest. keen's stepmother said hi

. >> beaumont wanted him to go under cover, in his low security lock-up to a dangerous prison and to defriend alleged serial killer larryconfessions from him, and if you can help us locate the bodies that are still missing, we're willing to completely wash your record. >> keene's mission, to learn from trisha was buried. >> the purpose of this operation was to find that body. >> beaumont made it clear -- no body, no early release. keene would have to serve the rest of his ten-year sentence, but beaumont believed keene could do it. >> he's smart, articulate, not afraid. and i knew he wanted to get out. >> for keene, it was a chance at redemption, to restore his family name, and to get his life back on track. >> this deal was a way for him to get home, and it was also a way for him to do good. to take this bad thing he had done and somehow turn it back inside out. >> but it wouldn't be easy. >> fair to say, he was risking his life. he could have been dangerous. absolutely. >> it was highly risky. these places don't have anything better to do but try to hurt you and kill you, too. >> keen was unsure, but a phone call home