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I believe it was written as a novel or short story by Damon Runyon.
Spoilers Ahead: In short, Jack Nicholson, Leonardo DiCaprio and Matt Damon are all murdered.
Les Damon's birth name is Lester Damon.
Damon Vracin's birth name is Damon A. Vracin.
Damon Pampolina's birth name is Damon Phillip Pampolina.