Unforgettable (1996)

"Unforgettable" is a 1996 Thriller movie directed by John Dahl and starring by Ray Liotta, Linda Fiorentino. Seattle medical examiner David Krane is obsessed with solving his wife's murder. A possible solution presents itself in an experimental "memory" serum designed by a neurobiology professor, which has the ability to transfer memories from one person to another, but with potentially fatal consequences.