Plot: CNN Correspondent Brynn Gingras dives deeply into the 13-year investigation into multiple murders of young women along Gilgo Beach and the man, Rex Heuermann, who has now been charged with these crimes. Last week, Heuermann was arrested and charged with murder in connection with the killings of three of the "Gilgo Four," a group of four women whose remains were found along a short stretch of Long Island's Gilgo Beach in 2010