Long Island serial killer Rex A. Heuermann maintained a four-day killing ritual, building trust with his victims before ending their lives in a basement "kill room" and dumping their remains near Gilgo Beach, a therapist reveals in a grisly new documentary episode. By the time Heuermann killed what he says was his eighth and final victim, the practice became so routine his stopwatch informed him it took just 37 seconds to dispose of the remains of Amber Lynn Costello along Ocean Parkway in 2010, a Sayville therapist discloses. Read the full story at the link in bio. (Photos: Howard Schnapp and James Carbone) - - #longislandny #gilgobeach #documentary #oceanparkway