Quincy, M.E. (1976)

S7E11 When Luck Ran Out

After a beloved racehorse owned by Quincy's friend Nelson Spencer unexpectedly dies following a major race, an insurance probe reveals signs of tampering. To complicate matters, the insurance investigator assigned to the case turns out to be Quincy’s new girlfriend. This unexpected twist places Quincy in a difficult position, torn between his loyalty to his friend and his relationship with his girlfriend.