Angelo Anthony Buono Jr. (October 5, 1934 – September 21, 2002) was an American serial killer, kidnapper and rapist who, together with his adopted cousin Kenneth Bianchi, were known as the Hillside Stranglers.

Buono had developed an extensive criminal history, ranging from failure to pay child support, grand theft auto, assault and rape.

Cruising around Los Angeles, California, in Buono's car and using fake badges, the two men persuaded their victims that they were undercover police officers.

They would then order the victims into Bianchi's Cadillac, which they claimed was an unmarked police car, and drive to Buono's home to torture and murder them.

Deciding that Bianchi was an unreliable and uncooperative witness, the case's original prosecutors from District Attorney John Van de Kamp's office moved to dismiss all charges against Buono and set him free.