A renegade loner NYPD narcotics detective who helps Roland investigate the O'Leary shooting. He assists Roland in retrieving a crucial evidence tape, kills corrupt officers who take Roland hostage, and pursues fugitives to LaGuardia Airport. Marks boards their plane, destroys an engine with a grenade, and jumps into the East River before the explosion.
Dalton and Marks form an unofficial partnership to investigate police corruption.
Marks actively works to prove Jones's innocence alongside Dalton.
Marks identifies O'Leary as a corrupt officer central to the conspiracy.
Marks' vigilante methods contrast with Cantrell's formal prosecutorial role.
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