Kenneth Bianchi (left) and Angelo Buono Jr.
Nicknames: The Hillside Stranglers
Number of confirmed victims: At least 9
Years and locations: 1970s, Los Angeles, Washington state
Characteristics: Buono and Bianchi were cousins who posed as police officers to trap teenage girls and young women, some of whom worked as prostitutes. Bianchi claimed that he suffered from multiple personality disorder but later admitted that he faked the condition. Buono owned an auto upholstery shop and was not a suspect until Bianchi was caught, confessed and identified his cousin as his accomplice.
Arrest, conviction and sentence: Bianchi was arrested on Jan. 12, 1979; Buono was arrested on Oct. 19, 1979. Bianchi was arrested in Bellingham, Washington, as a suspect in the murders of two college students at Western Washington University. He pleaded guilty to the slayings in Washington and confessed to five of the Los Angeles murders. He was sentenced to five life terms for murder and one additional life sentence for conspiracy. Bianchi is incarcerated at the Washington State Penitentiary in Walla Walla. Buono was arrested at his home in Glendale, California, the same day Bianchi admitted he participated in five of the Hillside killings. Bianchi testified during Buono's trial. Buono was convicted of nine murders and was sentenced to life in prison without the possibility of parole. He died in prison in 2002.
Confessed Hillside Strangler Kenneth Bianchi, (left) sits on the witness stand Wednesday, June 23, 1982 in Los Angeles, Calif., as he testifies against Buono. Angelo Buono (right) in court on Aug. 11, 1983. (AP Photos)