Billed as Mountain Man, the actor starred in Deliverance's "Squeal like a pig" scene, where his character and a backwoods friend rape Ned Beatty's adventurer Bobby.
McKinney, who also appeared in seven Clint Eastwood movies, died at the Valley Presbyterian Hospice in California after a long battle with lung cancer, according to TMZ.com.
A statement on his Facebook.com page reads, "An avid smoker for 25 years of his younger life, he died of cancer of the esophagus. He was 80 and still strong enough to have filmed a Doritos commercial 2 weeks prior to his passing, and he continued to work on his biography with his writing partner."
McKinney also appeared in Sam Peckinpah's Junior Bonner, The Life & Times of Judge Roy Bean, blaxploitation classic Cleopatra Jones, First Blood and The Green Mile as well as a string of popular TV series like The A-Team, Baywatch and The Fall Guy.