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SPOILER ALERT!!! In movie, "The Departed" why did Mark Wahlberg (Dignam) kill Matt Damon in the end?
Can you tell me why Mark Wahlberg's character killed Matt Damon's character in "The Departed"?
In the movie "The Departed," Mark Wahlberg's character, Dignam, kills Matt Damon's character, Sullivan, because he discovers Sullivan's true identity as an informant for the mafia.