Watch: Police Call Long Island Serial Killer Suspect Rex Heuermann a "Demon"An almost 20-year mystery has finally received closure. Rex Heuermann-an architect from Long Island who was arrested in 2023 in connection to murders known as the Gilgo Beach killings-pleaded guilty to seven murder charges during a Suffolk County court appearance on April 8, the Suffolk County District Attorney's Office confirmed in a press release. He also admitted to the 1996 killing of Karen Vergata, but as part of his plea deal, the release noted, will not be charged in connection with her death.