Don Grady Dead — ‘My Three Sons’ Star Dies at 68

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Don Grady — who played one of the sons on the TV classic, “My Three Sons” — has died at the age of 68 … this according to one of his co-stars.

“Sons” star Barry Livingston just posted on Facebook, “My dear friend and TV brother Don Grady passed away today. He was an inspiration to me in so many ways.”

Grady had reportedly been suffering from cancer.

Grady was an original Mouseketeer on the “Mickey Mouse Club”  … before going on to play the role of  Robbie Douglas on “My Three Sons” from 1960 to 1972.

Grady was also a pretty successful musician … he”s credited with writing the music for the Ellen Barkin movie “Switch” … and the theme song for “The Phil Donahue Show.”

Grady is survived by his wife Ginny and their two children.