question: Violated Angels is a film based on a mass murder spree which took place when?
answer: night of July 13-14, 1966
context: Title: Lennoxville massacre
  Passage: The Lennoxville massacre, or Lennoxville purge, was a mass murder which took place at the Hells Angels clubhouse in Lennoxville, Quebec on March 24, 1985.  Five members of the Hells Angels North Chapter, founded by Laurent "L'Anglais" Viau and Yves "Apache" Trudeau, were shot dead.  This event divided rival outlaw motorcycle gangs in Quebec, leading to the formation of the Rock Machine club, a rival to the Hells in the 1990s.
  Title: Richard Speck
  Passage: Richard Benjamin Speck (December 6, 1941 – December 5, 1991) was an American mass murderer who systematically tortured, raped, and murdered eight student nurses from South Chicago Community Hospital on the night of July 13-14, 1966.
  Title: Yema stabbings
  Passage: Yang Qingpei (born 1989 ) is a Chinese man accused of the mass murder of 19 people.  He confessed to killing his parents in an argument over money and then killing 17 neighbours in an attempt to cover up his crime on September 29, 2016, state media reported.  The youngest victim of the murderous rampage in a remote village in southwest China was three, the oldest 72.  They were members of six families.  Suspect Yang Qingpei, aged 28, went to his home village of Yema on Wednesday.  He was arrested in Kunming, capital of Yunnan Province, on Thursday.  The Xinhua state news agency report did not say how the villagers were killed.  Mass killings are rare in China and access to firearms is tightly controlled.  The crime took place in Qujing, Yunnan Province.
  Title: Violated Angels
  Passage: Violated Angels (犯された白衣, , Okasareta Hakui ) is a film made by controversial Japanese director Kōji Wakamatsu in 1967.  Wakamatsu's most famous film, it is based on the mass murder spree of Richard Speck in 1966.
  Title: Badlands (film)
  Passage: Badlands is a 1973 American crime film written and directed by Terrence Malick, starring Martin Sheen and Sissy Spacek, and featuring Warren Oates and Ramon Bieri.  The story, though fictional, is loosely based on the real-life murder spree of Charles Starkweather and his girlfriend, Caril Ann Fugate, in 1958, though that basis was not acknowledged when the film was released.
  Title: Silent Night, Deadly Night (franchise)
  Passage: Silent Night, Deadly Night is an American horror franchise consisting of six feature films, action figures, clothing, stockings, Christmas ornaments, and other memorabilia.  The first film in the series, "Silent Night, Deadly Night" (1984), originally titled "Slay Ride", tells the story of Billy, a young man who experiences a psychotic break and goes on a murder spree dressed as Santa Claus.  The film received theatrical distribution from TriStar Pictures, but was pulled from theaters in November 1984 after a series of protests against the film.
citations: Richard Speck Violated Angels