The filmmaker died of pancreatic cancer at Cedars-Sinai Medical Center here, according to The Hollywood Reporter.
Famous for bringing on screen the stories of underdogs and long shots who persevered and ultimately triumphed, Avildsen won a directing Oscar for "Rocky," which starred Sylvester Stallone as the titular Philadelphia boxer.
Avildsen also directed Susan Sarandon and Peter Boyle in the ultimately violent drama "Joe" (1970); guided Jack Lemmon to the Academy Award for best actor in "Save the Tiger" (1973) in a story about a businessman having a mid-life crisis; and kept things together on the set of "The Formula" (1980), which starred the temperamental actors George C Scott and Marlon Brando.
Stallone remembered the late director on social media.
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"The great director John G. Avildsen who won the Oscar for directing Rocky! R I P. I'm sure you will soon be directing Hits in Heaven- Thank you , Sly," he wrote.
Macchio tweeted, "RIP to my friend and KK director John G Avildsen. He brought inspirational stories to us all and had a guiding hand in changing my life."
He was also the subject of a documentary, "John G Avildsen: King of the Underdogs," that premiered this year at the Santa Barbara International Film Festival.
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