9x11 - Perry Mason

Police Sgt. Dave Wolfe warns Joe Oliver to stay away from his kid sister, Susan. Now Susan's been beaten up in her apartment, Oliver has been shot to death, and Dave is being charged with murder. Dave's story is that someone knocked him out and used his gun on Oliver. When Perry investigates the circumstances surrounding that night he discovers that six people in the building heard Susan's cries but did nothing to help her and that it was not Joe Oliver who beat her up. The wrong man was killed.