Harlan Lebo includes several pictures of the "White Fedora" sequence (Miohael killing Fabrizzio) in his outstanding book, "The Godfather Legacy." According to Lebo, FFC attempted to shoot the scene in NYC at a pizzeria, but Fourth of July weekend traffic ruined it. He later reshot it in Sicily but the sequence was never used. However, stills of that unseen scene are all over the place.
What I wouldn't give to see that scene!