Magnum, P.I.

Thomas awakes from a bad car accident in which he drove the Ferrari over a cliff on his way home from dinner with his clients, for whom he was searching for a missing young woman; the accident leaves him with amnesia, and as he struggles to remember the events that lead up to the crash, he becomes the prime suspect when the girl he was looking for is found murdered, and one of his baseball caps is found at the scene of the crime.