Who Killed Mary Whats'ername? 1971
Directed by Ernest Pintoff | Starring: Red Buttons, Sylvia Miles, Alice Playten, Conrad Bain
A prostitute is murdered on the streets of a tough, low-income neighborhood. A diabetic retired boxer who knew her is appalled by the lack of interest shown in the case by the police or anybody else in the neighborhood, and decides to investigate the case himself.