Psycho Sex Killer 1970 ( 1)

A serial killer is on the loose. And the victims have one thing in common --- they are all in the care of the same psychiatrist. Who could be the mysterious killer? The mama's boy who wakes up with blood in his hands. The neglected loner capable of murder... The police lieutenant in charge of the investigation... Or could it be the doctor, who herself was also a patient only a few years back?