but the disappearance of tricia reitler remained unsolved. garry reitler and donna, could not stop looking. >> we walked the sides of the roads. the riverbeds. we looked under the culverts. we went to crack houses because somebody had a lead. >> if you see something on the side of the road, a garbage bag, whatever, it's like -- could that be her? >> it was such 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. he had sent both keene and hall to prison. now he hatched a risky plan that would bring them toge

>> yes. >> do you think your brother killed tricia reitler? >> yes. >> rihanna rison?. >> as gary started talking more openly, detectives approached him asking for help. >> i went with the indianapolis detectives down to try to get my brother to confess. he made me leave the room. he did in fact confess on tape to 15 serial murders. >> larry later retracted again. and while he can't ever seem to stick to one story, he does sometimes seem to have regrets. >> i didn't want to keep living my life the way i was living it. i wanted things to be different, you know, but i guess i didn't really do the right things to change the way my life was going. >> larry hall refused our request for an interview. he has never been charged with crimes against anyone other than jessica roach. but keene's story has caused officials across the country to take another look at hall. >> in november of 2010 investigators from the police department interviewed mr. hall at a prison in north carolina. >> in that interview hall admitted murdering laurie de pughs and provided clues to finding her bod