American serial killer who murdered six people in New York City in 1976–77. His crimes plunged the city into a panic and unleashed one of the largest manhunts in New York history.

Berkowitz was a difficult and occasionally violent child. His erratic behaviour, which began after the death of his adoptive mother in 1967, intensified when his adoptive father remarried in 1971 and moved to Florida without him. In 1971 Berkowitz joined the army, and he became an excellent marksman before he left the service in 1974. According to Berkowitz's diary, he set some 1,500 fires in New York City in the mid-1970s.

Claiming he was driven by demons, Berkowitz attempted to murder a woman in December 1975, but she survived several stab wounds. He then murdered a woman in July 1976, and over the next year he attacked several couples, claiming five more victims. During his killing spree, he sent letters to New York newspapers, signing them “Son of Sam,” a reference to a demon he believed lived inside the black Labrador retriever owned by his neighbour Sam Carr.

Berkowitz was arrested on Aug. 10, 1977, 11 days after his last murder. His capture was the result of careful police work, which involved sorting through a confusing maze of reports of suspicious persons. Ultimately, Berkowitz was identified as the most likely suspect, a theory that was confirmed when his car was found to have received a parking ticket near the scene of one of the shootings. Berkowitz soon confessed, and on May 8, 1978, he pleaded guilty; in June he was sentenced to 365 years in prison. The furor surrounding the case was depicted in the film Summer of Sam (1999).