The serial murders for which the person able to kill multiple victims (and often accompanied by torture and persecution) and continues the murder to arrest, have criminological and psychological importance to single murder. Occurrence of serial murders is result of the external factors to internal and psychological. In fact, the location of important questions that explain why the some persons kill many victims, is killer the personality and his or her mental state not social factors. One of the common psychological factors in the occurrence of serial murders is personality disorders. In this paper, we study etiology of serial murder based on psychological view and personality disorders in which both major and widespread disorder a anti social and narcissism.