Son of Woolworth heiress Barbara Hutton spent his life as a socialite and Formula 1 racer.
A friendship with James Dean, who was a car racing fan, first sparked his interest in the sport.
He died in an airplane crash while scouting out locations for a planned Aspen ski resort.
He was married to the original Mickey Mouse Club girl, Cheryl Holdridge.
He became Cary Grant's stepson after Grant's brief marriage to his mother.