David Richard Berkowitz (born June 1 1953), also known as the .44 Caliber Killer and the Son of Sam, is an American serial killer.

Shortly after his arrest in August, 1977, Berkowitz confessed to killing six people and wounding seven others in the course of eight shootings in New York City between 1976 and 1977. He has been imprisoned for the crimes since 1977. The crimes had terrorized New York for a year. Berkowitz subsequently claimed that a neighbor's dog was possessed by a demon that commanded Berkowitz to kill.

Berkowitz later amended his confession to claim he was the shooter in only two incidents, personally killing three people and wounding a fourth. The other victims were killed, Berkowitz claimed, by members of a violent Satanic cult of which he was a member. Though he remains the only person charged with or convicted of the shootings, some law enforcement authorities argue that Berkowitz's claims are credible: according to John Hockenberry of MSNBC, many officials involved in the original "Son of Sam" case suspected that more than one person was perpetrating the murders. Hockenberry also reports that the Son of Sam case was reopened in 1996 and, as of 2004, it was still considered open.