Frenzy (1972) on Netflix

In London, a serial-killer is raping women and then strangling them with a neck tie. When the reckless and low-class with bad temper bartender Richard Blaney is fired from the pub Global Public House by the manager Felix Forsythe, he decides to visit his ex-wife Brenda, who owns a successful marriage agency. Her secretary Miss Barling overhears an argument of the couple, and Brenda invites Richard to have dinner with her in a fancy restaurant. Then she put some money in his overcoat and does not tell him to avoid his embarrassment with the situation. Meanwhile Richard's friend Bob Rusk visits Brenda in her office, rapes her and kills her with his neck tie. When Richard finds the money in his pocket, he visits Brenda but finds the agency closed; then he goes with his girlfriend Babs Milligan to an expensive hotel. Miss Barling sees Richard leaving the building and finds her boss strangled; she calls the New Scotland Yard and Richard becomes the prime suspect. When Bob kills Babs, he frames Richard that is arrested and sentenced to life. But the Chief Inspector Oxford that was in charge of the investigation is not absolutely sure that Richard is the serial-killer.