The Army vet’s second movie was the 1967 Sidney Poitier classic In the Heat of the Night. He followed by a string of Westerns, including 1972’s The Cowboys with John Wayne, Jeremiah Johnson with Robert Redford, and The Life and Times of Judge Roy Bean with Paul Newman. Clark also starred in Sam Peckinpah’s Pat Garrett and Billy the Kid in 1973, The Outlaw Josey Wales opposite Clint Eastwood in 1976 — and even 2014’s Western spoof A Million Ways to Die in the West.
Clark may be most well-known for playing the bartender in Back to the Future III and also had guest-starring gigs on Bonanza, Kung Fu and Dynasty.
"Clark was an ’actor’s actor’ who loved and respected the job, but was not concerned with stars and fame. He was impressed when working with good people who loved their families. He felt ’lucky’ about his career ... and ’he died the way he lived, on his terms,’" his family told TMZ.
He was 89.