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Uncovering David Biro's past

True-crime writer Gera-Lind Kolarik takes "48 Hours"' Maureen Maher to her secret storage locker in an undisclosed location to share her files on the Langert murders -- which have been locked up since her book, "I Am Cain," was published in 1995 -- giving an insight into the mind of David Biro.
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