Robert Wayne Danielson Jr. (August 25, 1946 – September 7, 1995) was an American serial killer who murdered at least six people during an eleven month killing spree in three states between 1981 and 1982, following his parole for murdering an acquaintance in 1970. Convicted and sentenced to death by the state of California, where two of his murders occurred, Danielson killed himself while awaiting execution at San Quentin State Prison in September 1995.