Who is Scott Coleman from Term Limits and what is their importance?

Scott Coleman is a former Navy SEAL commander, and the brother of Michael O'Rourke's deceased best friend, Mark. He is described as very strong and intelligent and never misses a detail when planning the assassinations of the politicians. When Scott learns that ten men died as a result of Fitzgerald's loose tongue while drink, he becomes enraged. As a result, he feels that he must avenge their deaths. This is the reason Coleman kills Fitzgerald first, with his bare hands.