A Secret Service agent who initially appears to be following protocol but is secretly in league with the terrorists. He attempts to kidnap Tyler, reveals his betrayal, and is ultimately killed by Darren.
Both belong to the Secret Service presence responding to the hostage crisis.
Matthew Hallmark is identified as a Secret Service agent, and the Secret Service teams up with the Pittsburgh Bureau of Police to surround the arena.
Hallmark covertly supports Foss's hostage operation from inside the Secret Service.
Matthew Hallmark is revealed to be secretly in league with Joshua Foss and attempts to kidnap Tyler during the arena takeover.
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