The Long Island Serial Killer and the arrest leading to the biggest true crime story of the summer. When 23-year-old Shannan Gilbert disappeared in May 2010, the search led police to Gilgo Beach, Long Island, where they found human remains – not of Gilbert, but of four other missing women who had been working as escorts: Melissa Barthelemy, Maureen Brainard-Barnes, Megan Waterman and Amber Costello. Eventually, authorities discovered six other bodies along Ocean Parkway. In the ‘Long Island Serial Killer’ full episode, “20/20” reports on the dramatic twists and turns in the more than decade long investigation to find the killer or killers – ranging from a federal investigation into a police chief to the latest forensic technology – until, according to authorities, the latest DNA technology resulted in the arrest of architect, family man and Long Island resident Rex Heuermann. He has been charged with murder in the deaths of Barthelemy, Waterman and Costello, and has pleaded not guilty just this year.
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