Actor Don Grady, Robbie on 'My Three Sons,' dies at 68 Hulton Archive / Getty Images The cast of "My Three Sons" in 1965 included Stanley Livingston, Fred MacMurray, Don Grady, William Demarest, and Barry Livingston. Actor Don Grady died Wednesday at the age of 68. Grady passed away in L.A. after a long battle with cancer, his family confirmed to Deadline. PHOTOS: Stars gone too soon The actor was most well-known for his role as Robbie Douglas in "My Three Sons" and was one of the original Mouseketeers on "The Mickey Mouse Club." He joined the show when he was only 13 years old. PHOTOS: Stars we've lost in 2012 Grady landed his role on "My Three Sons" in 1960 and pursued a career in music when the show ended in 1972. He recorded an album with his collection of songs, "Homegrown," in 1973. In 2008, he released a collection of songs about the baby boomer generation, titled "Boomer." PHOTOS: Stars who battled cancer The actor also appeared on stage in "Pippin," "Godspell" and "Damn Yankees." He is survived by his wife, Ginny, whom he married in 1985 and their two children. Do you remember Don Grady on "My Three Sons"?