Every day, law enforcement officers across America are called to respond to homicides. Each case is tragic. Each one means someone has lost a spouse, a parent, a sibling, or a child. Few cases, however, are more devastating and perplexing as serial murder. These multiple victim crimes may span days, months, or even years, and can cross numerous jurisdictions. Often the relationship between suspect and victim is difficult to discern, and the motive may remain a mystery. Investigators may have little to go on other than evidence at the crime scene where the murder victim is found. They face pressure from the public and the media to quickly solve these high-profile crimes, before the killer strikes again. As the clock ticks, investigators with different levels of expertise must sift through a vast amount of information to narrow down their pool of suspects. Although much information has been published about serial killers, much of it may be of little use to investigators working an active serial murder investigation. This monograph represents five years of empirical research gathered by experts at the FBI’s National Center for the Analysis of Violent Crime. Our hope is that it will give our law enforcement partners the resources they need to better understand the motivations and behaviors behind these crimes, to discover the necessary correlations between potential suspects and cases, and to more expeditiously identify, arrest, and convict serial killers.
The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States, which simultaneously serves as the nation's prime federal law enforcement agency. Operating under the jurisdiction of the U.S. Department of Justice, the FBI is concurrently a member of the U.S. Intelligence Community and reports to both the Attorney General and the Director of National Intelligence. A leading U.S. counter-terrorism, counter-intelligence, and criminal investigative organization, the FBI has jurisdiction over violations of more than 200 categories of federal crimes.