Alfred Hitchcock Presents S05E29 - The Hero

While traveling on a ship, Richard Musgrave meets a man named Keyser that looks like his former partner, a man he once robbed and left for dead. He talks to Keyser, but Keyser denies that he ever met Musgrave. Later, however, Keyser subtly reveals that he was indeed Musgrave's former partner. Musgrave becomes distraught and jumps overboard in remorse. Keyser jumps after him. He pretends to save him, but drowns him in the ocean. After Keyser is pulled back aboard the ship, he is awarded a medal for attempting to save a man he never met.