Brother's Keeper

T11, E21: Briscoe (Jerry Orbach) and Green (Jesse L. Martin) track suspect Cally Lonegan (Michael O'Keefe), in the death of his business partner, James Malloy. Lonegan has spent his life on the wrong side of the law, reputed to have mob connections. When an immigrant cab driver from Sierra Leone, who drove the killer away from the scene, identifies Lonegan and is later found dead detectives are convinced Lonegan is responsible in order to keep himself in the clear.