Paul Newman (January 26, 1925 – September 26, 2008) was an American actor, film director, producer, indyCar driver, enterpreneur, and activist who performed the voice of Doc Hudson in Cars. He was also one of the special racing consultants.
He passed away on September 26, 2008 from lung cancer at age 83. Doc didn't appear in Cars 2 because, according to Nathan Stanton, he too passed away in the gap between Cars and Cars 2.
Unused voice clips of Paul Newman originally recorded for the first film, as well as one from Cars: The Video Game, were used for Doc in Cars 3.