Berkowitz struggled with being adopted and with the concept that his mother did not want him. His murders began after a 3-year enlistment in the United States Army, the first occurring on July 29, 1976 when he fired into a car where two girls sat, wounding one and killing Jody Valentini.
The "Son of Sam" nickname came from a letter Berkowitz left at the scene of one of his crimes on April 17, 1977. Berkowitz began writing letters to the media, and was arrested on August 10, 1977. He had been issued a parking ticket near the scene of his final crime, and police investigation led them to Berkowitz, who immediately confessed. He was sentenced to 350 years in prison for the killings.
Berkowitz claimed to receive his orders to kill from an acquaintance's barking dog. He now says that story was untrue and that during the time of the killings, he was a Satanist. He survived at least one attempt on his life in prison, but his behavior in prison early in his sentence earned him the nickname of "David Berserkowitz." Berkowitz became a Born-again Christian in 1987 in prison and now works as a chaplain. In March 2002, Berkowitz wrote a letter to New York governor George Pataki asking that his parole hearing be cancelled.