Best remembered as Boy, son of Johnny Weissmuller's Tarzan and Maureen O'Sullivan's Jane in all those "Tarzan" movies.
Brother of actor Billy Sheffield
Johnny and his brother, Billy Sheffield, were both in Knute Rockne All American (1940), playing Knute Rockne at different ages.
Son of actor Reginald Sheffield.
Suffered his fatal heart attack at his home four hours after he fell off a ladder while pruning a palm tree.