Clyde

Clyde was a guard at the Boston Asylum and the cousin of Franklin.

Meeting McCarthy
Clyde is first seen bringing food to David McCarthy, but then proceeds to spit in the food and throw it to him. After that he goes to bring food to other prisoners.

Shootout at Asylum Grounds
When Walker is in position as a sniper McCarthy comes out of the building chased by Clyde. Walker shoots Clyde and kills him with a bullet to the head.