Final answer:
The Fox and Levin definition of a serial killer is a classification that focuses on the psychological motivation and behavior of individuals who commit multiple murders over a certain time. According to this definition, a serial killer is someone who kills at least three victims, usually strangers, in separate events.
Step-by-step explanation:
The Fox and Levin definition of a serial killer is a classification that focuses on the psychological motivation and behavior of individuals who commit multiple murders over a certain period, with a cooling-off period in between. According to this definition, a serial killer is someone who kills at least three victims, usually strangers, in separate events. This definition is widely used in criminal profiling and investigations.