Unforgettable (1996)

Medical examiner Dr. David Krane is a brilliant forensic pathologist who has lived under a cloud of suspicion since the cold-blooded murder of his wife, Mary. Accused of the crime, he was released on a technicality... but he was never exonerated. Mary was the one person who could have cleared him, but her memories died with her. When he meets Dr. Martha Briggs, a pioneering neurobiologist who has been experimenting with memory transfer, Krane sees his last chance at redemption. Briggs has discovered that profound memories are stored in cerebral spine fluid, and has developed a formula that can actually retrieve these events. If it works, Krane may have found the way to identify Mary's murderer. Driven by desperation, Krane steals the untested and potentially lethal formula and injects himself with Mary's memories. Suddenly, he is wrenched to the moment of her terrifying and brutal slaying, experiencing her fear, her pain and her horror... but he can't see her attacker.