Every serial killer is motivated to kill for different reasons: "Serial killers usually kill for one of several reasons, including personal enjoyment, stress relief, or even to maintain a personal set of goals." moral or rational values” (Parker 9). The most common motivation for killing is the satisfaction serial killers feel in having complete control over their victims; therefore, victims are usually raped or tortured. Many serial killers even commit necrophilia on their victims. According to researchers from Bath Spa University and Cranfield University, serial killers satisfy their need for power by torturing their victims: "They excessively rape and kill their victims often with mutilation, which provides sexual gratification" (Taylor et al. 37). The deviant behavior that serial killers often possess is caused by the need for power over their own