This film is based on the true story of the Hillside Strangler serial killings that terrorized Los Angeles in 1978 and 1979, but what no one knew was that the brutal murders were the work of not one man, but two; cousins Kenneth Bianchi and Angelo Buono.Hillside Strangler, is a frank, no-holds-barred account of this chilling true story starring C. Thomas Howell (Bianchi) and Nicholas Turturro (Buono).