Violent Midnight (1963)

Because his family has a history of mental illness, Elliot Freeman, a war hero turned portrait painter, is suspected of sadistically murdering two beautiful young women. Freeman knew both of the victims--Dolores Martello, an artist's model, and Alice St. Clair, a student at a nearby college--and he sets out to find the killer. At different times during his unofficial investigation, Freeman comes to suspect four men: Professor Melbourne, a peeping tom; Charles Perone, a motorcycle hoodlum; Adrian Benedict, a sophisticated lawyer; and a deaf-mute chauffeur. Freeman finally learns that his own sister, Lynn, jealous of the attentions that he paid to other women, committed the murders.