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Have been the worst moment of his life. >> i left. i came back downstairs. and my wife was talking at the time to 911 dispatch. and i said, "he's dead." >> roger and pam took a polygraph test. and what do you know? roger was found to be deceptive. and pam? was jumpy. the operator couldn't complete the test. but still, roger and pam swore up and down they had nothing to do with it, they were victims themselves. truth be told, the police needed some real evidence. and out of the blue something arrived. >> investigators are confronted with new evidence and strange does not begin to describe it. s...

A >> a few questions turned into many. >> did you have a key to the apartment? >> yes. >> and were pointed. >> did you hurt her? >> i would never -- i would kill myself before i hurt her. >> they would leave me alone in the room. they would ask me questions. >> oh, my god. oh, please tell me what am i going to do? >> after awhile the police told kevin, you could go home. they had other people to talk to, young men nona had been seeing while kevin was away at college. it wasn't long before the detectives found out the alibis of the other men checked out. as he prepared to say good-bye at the fu...

Cops run into it all the time. >> they say they do. >> and that's clearly what they were thinking when they talked to you. >> yes. >> did they make that clear? >> they didn't make much clear to us. they just said that we were not being cooperative with them. even though from the very beginning we told them everything that happened. they just didn't believe it. they didn't believe that two people would kill one person and leave two more alive. >> perhaps. but what about roger and pam's apparent financial troubles? >> we were not having any financial problems. if we were having financial problem...

>> it's gonna be bad for you if you fail the polygraph. >> i don't see any reason why i would fail a polygraph. >> reporter: oh, it would turn out be to be bad, very bad for matt. the bomb turned out to be a fake. >> certainly we're considering all possibilities, whether or not he was coerced. >> could your guys determine if the story was true or not? >> could not. >> there is no corroborating evidence other than his mom. >> no evidence to support matt's story. investigators searched his house and car, but found nothing. what's more, matt did take a polygraph test and failed parts of it.

Laura nirider of northwestern university's innocence project is a leading expert in false confessions by young people. she had heard about robert's case and offered to help. and help us understand what happened to robert as we watched the interrogation unfold. >> this is one of the most intense interrogations i have ever seen. >> you have the right to remain silent. anything you say can and will be used against you. >> you have these officers very, very close to robert. he is a big guy. pushed into that corner. increasing the pressure without even touching him. >> randy snead, a man robert has...