What is the modus operandi of Gerard john schaefer?

Gerard John Schaefer was a former police officer and convicted serial killer known for his gruesome methods of abduction and murder. His modus operandi involved luring young women, often using his authority as a police officer to gain their trust. Once he had them isolated, he would subject them to extreme violence, including torture before killing them. Schaefer's crimes were particularly heinous and marked by a pattern of sadistic behavior.