Quincy, M.E. (1976)

S4E1 The Last Six Hours

Excited to enjoy some time off with his new girlfriend, Barbara, Quincy escapes Los Angeles for a getaway. Their trip takes a dangerous turn when they're nearly forced off the road and then come across a horrific accident. Shortly after, Quincy is thrust into a high-stakes situation as he races against time to identify a mysterious toxin discovered in the victim's body, a poison that has already taken two lives.