The younger Bonaduce became famous as a child actor of the 1970s on the TV sitcom The Partridge Family. He co-starred as Danny Partridge, the wisecracking, redheaded middle son of the singing family band (headed by Shirley Jones). He and Shirley Jones were the only Partridge cast members whose actual first names were also that of the character each portrayed on screen. Danny was the fictional pop group's bass guitar player. Co-starring on the show was Jones's former stepson, David Cassidy; Cassidy and Bonaduce remained close friends until Cassidy's death on November 21, 2017. On January 20, 2018, Bonaduce attended David Cassidy's memorial service in Los Angeles.