A spree killing is the traditional criminological term for two or more murders committed at different locations during a single, continuous event, with no emotional break between the acts. It sits between mass murder (concentrated in one place) and serial murder (spaced out over time), though the FBI formally recommended dropping it as a separate classification in 2005 because the line between a spree and a serial case proved too hard to draw.
What a Spree Killing Means
In the traditional framework, a spree killer murders two or more people at different locations in what amounts to one prolonged violent episode. The defining feature is continuity. The offender moves from one scene to the next without pausing to resume ordinary life. Someone who commits a robbery-homicide at a gas station and then kills again at a second location an hour later while fleeing fits the classic profile.
Movement between sites is usually rapid and reactive rather than carefully planned. Because everything unfolds as part of a single chain of events, law enforcement historically treated the entire episode as one extended incident. The offender does not go home, sleep, show up to work, or otherwise reset. That absence of a psychological reset is what separates a spree from serial murder in the traditional framework.
Why the FBI Stopped Using the Term
At its 2005 Serial Murder Symposium, the FBI brought together more than 130 experts to reexamine how multiple homicides should be classified. The group spent considerable time debating whether “spree murder” deserved its own category. The consensus was that it did not. As the FBI’s published report put it, “the confusion surrounding this concept led the majority of attendees to advocate disregarding the use of spree murder as a separate category. The designation does not provide any real benefit for use by law enforcement.”1Federal Bureau of Investigation. Serial Murder: Multi-Disciplinary Perspectives for Investigators
The core problem was the cooling-off period. Distinguishing a spree from a serial killing hinged on whether the offender had emotionally reset between murders, and that turned out to be nearly impossible to measure consistently. One investigator might see a twelve-hour gap as continuous action; another might see it as a cooling-off period. The arbitrary nature of that judgment created more confusion than clarity, so the FBI folded what had been called spree killings into its broader serial murder framework.
In practice, real cases rarely fit neatly into either box. An offender who kills three people over 48 hours but sleeps at a motel between the second and third murder has arguably paused, but hardly returned to normal life. Forensic evidence can establish a timeline of movements, and witness testimony can reveal whether the offender engaged in routine activities, but neither tool reliably measures someone’s internal psychological state. Many criminologists and textbooks still use the term, but it no longer carries official weight in FBI classifications.
How Mass Murder and Serial Murder Compare
Mass murder is the most geographically concentrated form of multiple homicide. The FBI has long defined it as four or more victims killed in a single event, typically at one location or in close geographic proximity.2National Mass Violence Victimization Resource Center. About Mass Violence The episode usually ends within hours through the offender’s death, surrender, or capture. There is no movement across distant locations and no extended timeline.
Federal law uses a different threshold. The Investigative Assistance for Violent Crimes Act of 2012 defines “mass killings” as three or more killings in a single incident for purposes of authorizing federal investigative assistance.3Office of the Law Revision Counsel. 28 USC 530C – Authority to Use Available Funds That statutory definition is narrower than the FBI’s traditional four-victim threshold, which means federal resources can be triggered at a lower body count than many people expect.
Serial murder sits at the opposite end of the timeline. The federal definition at 28 U.S.C. § 540B describes serial killings as “a series of three or more killings, not less than one of which was committed within the United States, having common characteristics such as to suggest the reasonable possibility that the crimes were committed by the same actor or actors.”4Office of the Law Revision Counsel. 28 USC 540B – Investigation of Serial Killings That statute was enacted through the Protection of Children from Sexual Predators Act of 1998 and primarily authorizes the FBI to assist state and local agencies in serial killing investigations.
At the 2005 symposium, the FBI proposed a broader working definition of serial murder: “the unlawful killing of two or more victims by the same offender(s), in separate events.”1Federal Bureau of Investigation. Serial Murder: Multi-Disciplinary Perspectives for Investigators Lowering the threshold from three to two and dropping the “cooling-off period” requirement was intentional. The participants wanted a definition flexible enough to capture the full range of serial offending without debates over whether an offender had psychologically reset.
So the simple comparison: a mass killing is concentrated in one place and ends quickly. A serial killing is spaced out over time, with the offender blending back into ordinary life between murders. A spree, in the traditional sense, is the continuous middle ground, which is exactly why the category collapsed when examined closely.
Where the Spree Label Still Matters
The concept has lingering weight in prosecution. When a defense attorney argues that each killing was a separate, premeditated act (suggesting serial murder) rather than part of a single emotional explosion, the characterization can influence how jurors perceive the offender’s mental state and culpability. Whether the violence was impulsive and continuous or deliberate and episodic can affect the viability of certain defenses.
Outside the courtroom, the term survives in academic writing, media coverage, and public conversation. It is still useful shorthand for a recognizable pattern of violence, even if federal investigators no longer treat it as a formal classification.
What Federal Law Actually Covers
Most homicides are state crimes, prosecuted under state law. Federal jurisdiction over multiple killings is limited and typically requires a specific statutory hook. Two provisions do most of the work:
- 28 U.S.C. § 540B authorizes the FBI to investigate serial killings at the request of the head of a state or local law enforcement agency. The statute defines serial killings as three or more with common characteristics suggesting the same offender.4Office of the Law Revision Counsel. 28 USC 540B – Investigation of Serial Killings
- 28 U.S.C. § 530C(b)(1)(M) authorizes the Attorney General to assist in investigating mass killings (three or more in a single incident) and violent acts in places of public use, at the request of state or local officials.3Office of the Law Revision Counsel. 28 USC 530C – Authority to Use Available Funds
Neither statute specifically addresses spree killing, and there is no standalone federal “spree killing” statute. A killing spree that crosses state lines may trigger federal interest through other mechanisms, but these cases are usually prosecuted by the state where each individual murder occurred, with federal agencies providing investigative support rather than taking over prosecution. The absence of a dedicated federal provision is one more reason the label carries little legal weight even as it remains in common use.