The Departed : What happens after Dignam shoots Sullivan??

I mean technically, it's considered murder right?? Since dignam was off the force and even though he has proof that proves Matt Damon is the rat, there's no justifying in shooting him..I think he would later take Costigan's evidence and expose Sullivan, still would he face any kind of punishment at all for killing Sullivan??

I don't think Dignam intends on getting caught. If caught he could be arrest and prosecuted for murder. It was premeditated - it wasn't self defense - it was clear cut murder.

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