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“The mass murderer and the serial killer are quantitatively and qualitatively different, and disagreement continues about their characteristics just as it does about the types of mass and serial offenders that appear to have emerged in recent years. Researchers have distinguished spree murders from mass and serial murder as being three or more victims killed by a single perpetrator within a period of hours or days in different locations. They often act in a frenzy, make little effort to avoid detection, and kill in several sequences. Offenders may kill more than one victim in one location and travel to another location. There appears to be no cooling-off period even though the murders occur at different places (Greswell & Hollin, 1994).”
― Eric W. Hickey, Serial Murderers and their Victims