Actor John Cazale, best known as Fredo Corelone in The Godfather,  had a brief career in Hollywood, appearing in only 5 films. Those five films though, were all nominated for the Academy Award For Best Picture...!!  He died of cancer in 1978 at the age of 42...

John Cazale Filmography...

#1 - The Godfather - 1972

#2 - The Conversation - 1974

#3 - The Godfather Part 2 - 1974

#4 - Dog Day Afternoon - 1975

#5 - The Deer Hunter - 1978