Case Closed (1996)

Season 7

Episode 13: The Man Who Was Killed Four Times

Kogorou is called to investigate a suspicious murder where three people admit to killing a man for hitting him on the head. His posture showed the death to be a heart attack. They are all actors in an actor studio, their boss was the manager. After seeing the evidence, they find out that all four of them have attacked him but not killed him. He was killed by his wife who stole his heart pills and he died of a heart attack.