. >> soon the detective was joined in his work by commander alfred calhoun, known in these parts, whent came to murder investigations, as something of a closer. >> alfred stepped out of the interview room, says he wants to talk to you. so when i walked in the room barry was crying. and he admitted to killing kimberly nees. >> a tape recorder was turned on. and there it was, barry beach confessed to killing kim nees. you heard a lot of confessions over the years. >> oh, yes. >> and when you heard that one, had the ring of authenticity? >> oh, absolutely. >> when he heard the news, the sheriff in montana was convinced they had the real killer. >> this confession is good. it's solid. he did it. >> and why were authorities so sure beach killed kim nees? it was his confession. the story he told. the afternoon before she was killed, beach said, he came down to the river for a beer and a swim. and when it was time to go home, his car wouldn't go. he lost his temper. got furious. walked home, went to bed. ah, but then beach said he woke up around midnight, went for a walk. kim picked him up in