stabbed to death by her other daughter in 2016, before she could see Shannan’s killer caught. In the movie’s original synopsis, it said, “Though the search for the killer is still ongoing, Mari’s passionate dedication to giving her daughter and other forgotten women a voice, and the attention they deserve, has kept the case alive with hopes of a breakthrough soon.” However, there was a breakthrough in the case on July 14.Heuermann, 59 – a New York City architect and married dad of two – was arrested and charged in three of the killings: Megan Waterman, Melissa Barthelemy and Amber Costello. He was caught after DNA from the hair of victim Megan Waterman matched his DNA, which investigators took from a discarded pizza crust in January.Lifetime’s “The Gilgo Beach Killer” will feature new content from executive producer and Emmy Award-winning journalist Deborah Norville, who will provide updated and new details about the case.