https://www.hollywoodreporter.com/news/bobby-diamond-dead-fury-actor-was-75-1213438
Bobby Diamond later became a lawyer according to this obit.
He also was on 'The Twilight Zone' and 'The Many Loves of Dobie Gillis' but passed up a chance to play one of the boys on 'My Three Sons.'
Bobby Diamond, who portrayed a young orphan opposite Peter Graves and a wild stallion on the 1950s NBC series Fury, has died. He was 75.
Diamond died May 15 of cancer at Los Robles Regional Medical Center in Thousand Oaks, Calif., author and longtime friend Laurie Jacobson told The Hollywood Reporter.
Diamond also starred with Jack Klugman on "In Praise of Pip," a 1963 episode of The Twilight Zone, and played Duncan "Dunky" Gillis, a cousin of Dwayne Hickman's title character, on the final season of another CBS series, The Many Loves of Dobie Gillis.
Legend has it he was in the running to portray Robin the Boy Wonder on ABC's Batman before producers decided that at 21 he was too old and went with Burt Ward instead.
Bobby Diamond later became a lawyer according to this obit.