James Caan’s cause of death has been confirmed, just weeks after the beloved actor’s sudden death. The Bronx, New York-born Oscar-nominated “Godfather” star died from a heart attack and coronary artery disease, according to his death certificate obtained by TMZ. Chronic obstructive pulmonary disease and congestive heart failure also afflicted the “Misery” actor, according to the outlet. Caan died July 6 at the age of 82. Multiple famous friends, including co-stars from “The Godfather,” came out to mourn the actor after his unexpected passing. “Jimmy was my fictional brother and my lifelong fri…