Four Flies on Grey Velvet

4 mosche di velluto grigio is a movie starring Michael Brandon, Mimsy Farmer, and Jean-Pierre Marielle. A musician is stalked by an unknown homicidal maniac, who blackmails him for the accidental killing of another stalker.
Roberto, a drummer in a rock band, keeps receiving weird phone calls and being followed by a mysterious man. One night he manages to catch up with his persecutor and tries to get him to talk but in the ensuing struggle he accidentally stabs him. He runs away, but he understands his troubles have just begun when the following day he receives an envelope with photos of him killing the man. Someone is killing all his friends and trying to frame him for the murders.