The Killer Is Still Among Us (1986)

Inspired by true events, the movie is about Christina Marelli (Mariangela D'Abbraccio) a criminology student, who is writing her thesis on a serial killer which is terrorizing an Italian city. As her investigation proceeds, she meets a young forensic and they fall in love. The maniac keeps on killing, and then she begins to suspect that her new boyfriend may be the psycho that she is writing about.