Murphy's Law - Season 2 Episode 6 The Group

Murphy finds himself before a disciplinary review board after having shot a suspect during an arrest and soon out of the force completely. He approaches psychologist Mark Maddison, who runs a support group for individuals who have have lost someone to violent crimes. In fact, Murphy is undercover as at least three suspects have been killed and all had some connection to a member of the group. However, Murphy's loyalties are torn when they provide him with the identity of the man who killed his daughter years earlier.