He is the half-brother of Shaun Cassidy, Ryan Cassidy, and Patrick Cassidy.
Has a daughter, Katie Cassidy, a.k.a. Katherine Evelyn Benedon, born 25 November 1986, from a previous relationship.
He had his gall bladder removed in 1972 after a concert in Wildwood, New Jersey.
At his peak of his career, David was the world's highest paid live entertainer, and his official fan club was the largest in pop history -- exceeding Elvis Presley and The Beatles.
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