Hardcastle and McCormick (1983)

S2E20 Undercover McCormick

Title: Undercover McCormick Plot: When a young officer approaches Hardcastle for assistance with a case involving corrupt police, tragedy strikes as he is murdered before they can escalate the matter within the department. With the investigation tangled in a web of deceit and the potential for the rogue officers to identify them, McCormick is brought in to go undercover. His mission is to expose the corrupt officers and uncover the truth behind the patrolman's death.