Diagnosis Murder

Tonight Dr. Mark Sloan (Dick Van Dyke) is pulled back into a case that has sat cold for 30 years. A teenage girl disappeared in 1975 and a local charity later discovered that its accounts had been siphoned off. Sloan’s unusually sharp memory of a hospital chart from that summer points to a nurse who vanished shortly after the girl was last seen. He teams up with his son Steve and Detective McCall, combing through old police reports and bank ledgers. As they chase a trail of forged signatures, a forgotten love affair emerges, giving the missing‑person file a new angle. The investigation forces Sloan to confront a mistake he made early in his career, while Van Dyke slips in his trademark one‑liners. The episode wraps the mystery neatly, delivering a tidy solution and a reminder of why the doctor‑detective still works the night shift.