The Strange Vice of Mrs. Wardh (1971)
The Strange Vice of Mrs. Wardh (Italian: Lo strano vizio della Signora Wardh; released as Blade of the Ripper in the United States) is a 1970 giallo murder mystery film directed by Sergio Martino. It is his first entry in the giallo subgenre. The letter "h" was added to the name "Ward" when an Italian woman named Mrs. Ward threatened legal action over the original title's potentially damaging her good name, just before the film was released. The film was also known as Next! or The Next Victim.
More at Wikipedia.