Serial killers are not the same as mass murderers, nor are they spree killers,
who commit murders in two or more locations with virtually no break in between. A serial killer is typically defined as an individual who has killed three or more people over a period of more than a month. The motives of serial killers are generally placed into four categories: visionary, mission-oriented, hedonistic and power or control; however, the motives of any given killer may display considerable overlap among these categories.
