He became a car upholsterer in 1975 and was, despite his physical appearance and abusive behavior, considered very attractive to women. The following year, Buono married once again, to a woman named Deborah Taylor, but didn't live with her. Campino later divorced him in 1971 like his previous two wives, not only because he was abusing her, but also because he raped her daughter. On an unspecified date, Buono was arrested for stealing cars and sentenced to one year in prison, but due to his large family, the sentence was suspended so he could work. He got married a third time the following year, to a single mother named Nannette Campino and conceived two children with her. Castillo tried to reconcile with him, but after he handcuffed and threatened her at gunpoint, she abandoned her intentions. Buono and Castillo's marriage also ended in divorce in 1964 she claimed that he had been physically and sexually abusive. In 1964, Buono was believed to have raped his two-year-old daughter Grace, although there isn't enough information from sources to elaborate upon the incident. Later on, he married Mary Castillo, whom he also impregnated earlier on, and fathered a total of five children with her. Buono and Vinal's child, named Michael, was later born on January 10, 1956, but Buono divorced Vinal and refused to pay child support for Michael.

In 1955, he married his high-school sweetheart, seventeen-year-old Geraldine Vinal, whom he had impregnated, but left her less than a week later. Buono began stealing cars and was placed in reform school. 'The Red Light Bandit', considering him his 'hero' even though he believed that Chessman should have also killed his victims. Buono also idolized serial rapist Caryl Chessman, a.k.a. He displayed a high interest in sex at a young age and, when he was a teenager, claimed to his classmates to have raped several girls. When Buono was five, he moved to Glendale, California with his mother Jenny and his sister Cecilia.

His parents were Italian immigrants who divorced when he was young. Buono was born in Rochester, New York, on October 5, 1934.

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