NEW: A neighbor spoke to the NY Post & alleged a cop told them a ‘sound proof room’ has been discovered in Heuermann’s basement. Rex is a suspect in the search for the Long Island serial killer, who is responsible for the Gilgo beach murders. #fyp #rexheuermann #gilgobeach #gilgo4 #serialkiller #crimetok #harrowing #truecrime #crimejunkie #harrowing #scary #lisk #longislandserialkiller