Zodiac killer, unidentified American serial killer who is believed to have murdered six people, primarily in northern California, between 1966 and 1969 The Zodiac killer’s apparent first victim, an 18-year-old college student, was stabbed to death in Riverside, Calif., in 1966. Although this murder is commonly attributed to the Zodiac killer, some experts claim it was not committed by him. Soon after the murder, a … Continue reading Zodiac Killer