This document provides information about serial killers from an FBI profiling perspective. It defines serial killers as those who murder 2 or more victims with a cooling off period between killings. It profiles some of the most notorious American and international serial killers. It discusses characteristics of organized and disorganized killers. The document also examines profiling techniques used to understand crime scenes and killer psychology/motivations. Fantasy is identified as playing a key role in the development of serial killers. Survival tips are also presented.