This is a case of an unknown serial killer who terrorized the Los Angeles area in the late 1970s. The Hillside Strangler is believed to have killed at least 10 women and girls between October 1977 and February 1978. The victims were found in the hillsides of Los Angeles, often
From Wikipedia
The Hillside Strangler, later the Hillside Stranglers, is the media epithet for one, later discovered to be two, American serial killers who terrorized Los Angeles, California, between October 1977 and February 1978, with the nicknames originating from the fact that many of the victims' bodies were discovered on the wooded hillsides surrounding the city. The perpetrators were identified as cousins Kenneth Bianchi and Angelo Buono Jr.