Don Grady, the former child star who played middle son Robbie Douglas on long-running family sitcom My Three Sons, which aired between 1960 and 1972, died on Wednesday in Thousand Oakes, Calif. at the age of 68 after a battle with cancer.

Grady is survived by his mother, Mary, his second wife, Ginny, and their two grown children, Joey and Tessa, according to the Hollywood Reporter.

Before he played Robbie on My Three Sons alongside Fred MacMurray, William Frawley (later replaced by William Demarest), Tim Considine, Stanley Livingston and Barry Livingston, Grady was also cast as one of the iconic Mouseketeers on Disney's original Mickey Mouse Club.

Later, Grady went on to briefly star in several off-Broadway musicals, including a national tour of Pippin. His run in musicals made him realize that, as he put it years ago, according to People, "I wanted to make my living as a composer." Grady was equipped to do so, as he had grown up something of a musical prodigy who played eight instruments.

Grady went on to go to compose music for the Blake Edwards films, Skin Deep and Switch, as well as the theme song for the The Phil Donahue Show.

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