Hamill married dentist Marilou York in a private civil ceremony on December 17, 1978. They have three children together: Nathan (born September 25, 1979), Griffin (born March 4, 1983), and Chelsea Elizabeth (born July 27, 1988) On January 11, 1977, Hamill was in a car accident in which he fractured his nose and left cheekbone, requiring seven hours of surgery. According to Hamill in a recorded interview, he was driving his BMW on a freeway and became distracted, and seeing that he was missing his offramp, tried to negotiate four lanes of traffic (some real scars from the crash made an appearance in "The Empire Strikes Back").