"48 Hours" correspondent Erin Moriarty uncovers new information into the death of Shannan Gilbert and the veteran detective who ran the Long Island serial killer investigation speaks out on network television for the first time. [EDITOR'S NOTE: In July 2023, Rex Heuermann, an architect from Massapequa, Long Island, was arrested and charged with the murders of Megan Waterman, Amber Costello and Melissa Barthelemy. He pleaded not guilty. Heuermann is considered a prime suspect in the death of Maureen Brainard-Barnes. The wrongful death suit against Dr. Peter Hackett has been dismissed.]NEW EPISODES STREAMING SATURDAYS
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