Captain of the MSP Special Investigation Unit who orchestrates the undercover operation against Costello. Queenan recruits and guides Billy Costigan, urging him to stay the course despite severe psychological stress. When Sullivan discovers Queenan is meeting with his mole, Costello's men ambush them. Queenan sacrifices himself to help Costigan escape, only to be pushed to his death from a building.
Police captain and undercover handler guiding Billy's mission.
Mole who betrays and orchestrates the death of the police captain.
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