The producer and director passed away on Tuesday (13Sep11) after suffering a heart attack in Redondo Beach, California, according to Variety.com.
Hunt's first job was making surfboards, and his career in Hollywood began after he landed the role of a surfer in the 1964 movie North Swell.
He then stepped behind the camera for The Psychedelics in 1966, and went on to helm films including California Country, Fusion, You, Merlin and The Harem Bunch.
Hunt also worked with Orson Welles from 1970 until the Citizen Kane director's death in 1985, teaming up to make The Other Side of the Wind, which was never finished.
The filmmaker also distributed underground movies through his firm Canyon Films.