Dead Rising 2
Derrick and his hunting pals murder an innocent man that was wandering in Fortune Park. He and his friends go on about how they believe the zombies and survivors are communists sent to destroy democracy. They are determined to cleanse America of these "traitors", one city at a time.
Derrick is found on the roof of the Atlantica Casino that can only be accessed from a room near the indoor underground access north of the casino.