Ex-convict and neighborhood store owner whose daughter Katie is murdered. He conducts a parallel vigilante investigation, kills a former associate, and murders Dave Boyle after forcing a false confession, disposing of his body in the Mystic River before confessing to his wife.
Longtime friends connected by a shared traumatic past.
Grew up together in the same Boston neighborhood.
Jimmy despises Brendan due to his relationship with his daughter.
Jimmy's past criminal actions directly oppose Whitey's law enforcement duties.
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