John Cazale

Who?

The actor who played Fredo Corleone in "The Godfather" and "The Godfather, Part II" and Sal in "Dog Day Afternoon." All three are great movies. He also acted in "The Deer Hunter," (which I hear is a great movie) and "The Conversation" (which I'm not familiar with -- yet). And they're the only five movies he made. See http://www.imdb.com/name/nm0001030/bio