Richard Kiel -- Bond Villain Died Of Heart Disease

Richard Kiel -- who famously played Jaws in 2 James Bond movies -- died from serious heart problems ... and possibly a heart attack, according to his death certificate.

The certificate -- filed in Fresno County, CA -- lists the immediate cause of death as a POSSIBLE heart attack. It also shows 7' 2" Kiel had suffered from coronary artery disease for several years.

The 74-year-old actor died Sept. 10 in a Fresno hospital ... after being admitted for a broken leg. According to the document, the leg injury was a contributing factor, but not an underlying cause of death.