A seasoned and abrasive Sergeant in the Massachusetts State Police Special Investigation Unit. Dignam works alongside Captain Queenan to recruit and manage undercover agents targeting Costello's organization. After Queenan's murder, he is suspended following a confrontation with Sullivan. Despite his suspension, he later investigates Queenan's files, discovers the truth about Costello's FBI cooperation, and ultimately executes Sullivan at Costigan's funeral.
Sergeant who supports Billy's undercover operation and seeks vengeance later.
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