Episode 610, "Old Soldiers" Tonight 1|12c AM
SEASON 2, EPISODE 212 - When Don and his team are called to the murder scene of a Los Angeles gang member, they learn that it is a fellow agent who had been working undercover. Without exposing the agent's cover, Don must investigate his murder by a rival gang and try to crack the gangs' leadership and territories to find the suspect. But the agents are surprised when they learn who is responsible for the source of the rivalry. Will Patton ("The Agency") guest stars as LAPD Lieutenant Gary Walker, who is in charge of LAPD's Gang Impact Team.