Unforgettable (movie, 1996)

Ray Liotta stars as a medical examiner who has been acquitted for his wife's murder but many still question his innocence. Obsessed with finding his wife's killer, a possible solution presents itself in an experimental serum designed by a neurobiology Linda Fiorentino which has the ability to transfer memories from one person to another, but not without consequences. Liotta driven to solve the case injects himself with the serum, bringing him closer and closer to finding her killer but bringing him closer to death.