Violated Angels is a film based on a mass murder spree which took place when?
Violated Angels:  Wakamatsu's most famous film, it is based on the mass murder spree of Richard Speck in 1966. Richard Speck: 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.
night of July 13-14, 1966