His eldest son, Anthony Avildsen,confirmed the newsto the Associated Press.

He was a pretty extraordinary man in my estimation, he said.

The 1976 film, which Stallone wrote, also claimed Oscars for best picture and editing.

The 32nd Santa Barbara International Film Festival - General Events - Day 3

Credit: Matt Winkelmeyer/Getty Images

Though it proved to be a huge hit, Avildsen wasnt sold on the project at first.

When this script came to me from an old friend …

He pleaded and pleaded, so I finally read the thing.

And on the second or third page, hes talking to his turtles, Cuff and Link.

And I said yes.

Avildsen is also the subject of the upcoming documentaryJohn G. Avildsen: King of the Underdogs.