The last shot you hear is when Brannan walks over to Dinkheller after shooting him several times, and stands over him and shoots him in the face. It is a hard one to watch, not just because he is a LEO, but because he is a human being doing a job that not many people wish to do once they are no longer playing in the back yard with their friends. A job that I can say without knowing, he didn't get paid enough to do. A job where most people just want to sit back and curse him until they need him for something. Dinkheller was wrong, and like Token stated, it cost him his life. I have said it before and I will say it again, if you don't think you can pull the trigger when the time comes, then find another job.