Why at the end of the movie The departed mark walhberg kills Matt Damon .. it!

Question: Why at the end of the movie The departed mark walhberg kills Matt Damon .. it's puzzling me

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Answers: Why at the end of the movie The departed mark walhberg kills Matt Damon .. it's puzzling me

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because Mark Walhberg figured out that Matt was the inside guy and most of his friends got killed because of him and the info his was giving Jacks Character

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Cause he doesn't like him and Leo's character sent him proof that Matt Damon was the rat for Jack Nicholson

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Nice surprise ending! He shoots the Matt damon character because he's figured out that he's the department mole and virtually untouchable.Rough Justice at it's very best.

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