The United States has produced more documented serial killers than the next ten countries combined. That gap is so large it’s almost implausible, and according to Dr. Eric Hickey, one of the world’s leading forensic researchers on serial murder, part of the reason may have nothing to do with Americans being inherently more dangerous.
Dr. Hickey has spent his entire career specializing in serial and mass murder, victimology, and criminal profiling. His book Serial Murderers and Their Victims is used as a teaching tool by universities and law enforcement agencies worldwide. When asked why serial killers in America seem so prevalent, his answer centers not on some dark American psyche, but on a set of cultural, structural, and institutional forces that make the United States unlike anywhere else on earth. Some of those forces produce real crimes. Others simply make those crimes more visible.
The actual number of serial killers active in the US right now is likely far lower than most people assume, but the historical record and the ongoing cultural conditions that created it deserve a serious look.
How America Defines the Problem – and Counts Serial Killers in America
Before counting killers, the definition matters. At a 2005 symposium in San Antonio, Texas, the FBI officially defined serial killing as “the unlawful killing of two or more victims by the same offender in separate events.” That threshold – two victims, separate occasions – is intentionally broad. It captures everything from a calculated predator operating over decades to someone who killed twice before being arrested within weeks.
The United States leads by a vast margin, with documented serial killer counts many times higher than even the second-highest country. Researchers at the Radford University/FGCU Serial Killer Database have catalogued over 4,700 confirmed serial killers globally, examining them in terms of race, gender, methods, and the country where they committed their murders.
The US dominance in that database isn’t subtle. It raises an immediate question that criminologists have debated for years: is this a real phenomenon, or a measurement artifact?
The Detection Argument
Dr. Mike Aamodt, a forensic psychology professor at Radford University who built and maintains the Serial Killer Database, argues that the US really doesn’t have a disproportionate number of serial killers. His position, shared by others in the field, is that what America actually has is a superior infrastructure for catching them. His theory holds that it’s much easier to find serial killers in the US than in most other countries.
Dr. Hickey points out that serial murder is often not as reported in other countries, that homicides are not recorded nearly as thoroughly, and that the US is considerably more accurate in its reporting. A murder that goes unrecorded doesn’t enter any database. A pattern that’s never investigated never produces a suspect. The apparent global dominance of American serial killers may reflect, in part, that the US has built the world’s most thorough apparatus for identifying and counting them.
That apparatus has a documented origin point. In 1972, the FBI’s Behavioral Science Unit was created at Quantico to consult with criminal justice professionals worldwide on different types of violent criminal behavior. Before that unit existed, the analytical framework for connecting crimes across jurisdictions – linking victims to a single unknown offender – was largely informal. In 1985, the National Center for the Analysis of Violent Crime (NCAVC) was established at the FBI Academy to provide investigative support for violent crimes, giving law enforcement a dedicated national resource for exactly this kind of cross-jurisdictional serial crime analysis. No comparable institutional structure existed in most other countries at the time, and in many places, still doesn’t.
The Hollywood Effect
Detection infrastructure explains part of the gap. Culture, according to Dr. Hickey, explains another part – and this one is harder to quantify but impossible to dismiss.
Hickey points directly to Hollywood, noting that in American culture, violence is glamorized in ways that many other societies simply don’t do. The US has produced an entire entertainment industry built around real and fictional killers – documentaries, dramatizations, true crime podcasts, and feature films that reconstruct crimes in intimate detail, often making the perpetrator the most compelling character in the story.
Hollywood plays a central role by turning real violence into popular entertainment, and this constant media spotlight can trigger competitive instincts in vulnerable individuals. Research from Eastern Kentucky University suggests that media coverage of serial murder is theorized as a possible cause, with potential killers easily exposed to information about methods, victim selection, and how killers evaded detection for years. The coverage intended to inform can, in some cases, also instruct.
Hickey also identifies domestic violence as a contributing factor, noting its prevalence in American culture. The relationship between domestic violence exposure and later violent offending is well-documented in clinical literature – early experiences of violence normalize it, and in a small subset of individuals with other risk factors, that normalization can escalate.
Who Serial Killers Actually Are
The cultural image of the serial killer – calculating, charming, genius-level IQ – is almost entirely a media construction, according to Dr. Louis Schlesinger, Professor of Forensic Psychology at John Jay College of Criminal Justice and a co-principal investigator in a joint research project with the FBI’s Behavioral Analysis Unit studying sexual and serial murder.
Serial murderers tend to be lone, white males. Most kill for financial gain or personal gratification, with 32% on record stating they killed for financial gain. The motives are often mundane: money, control, the elimination of someone perceived as an obstacle. The elaborate psychological narratives that dominate crime entertainment are outliers, not the norm.
Only about 16% of serial killers are believed to be female. Dr. Hickey has explained this as a fundamental difference in how men and women process problems and trauma, noting that women tend to find other ways of moving on.
The psychology of violent offending is more varied than most people expect. Dr. Schlesinger has described the drivers of serial sexual killing as a biopsychosocial phenomenon, with a heavy emphasis on neurobiology, and argues that many things have to go wrong in order for someone to become a serial sexual murderer. No single factor – genetics, childhood trauma, personality disorder – is sufficient on its own. The cases that produce serial killers typically involve multiple overlapping failures across development, environment, and biology.
The Peak, the Decline, and What Remains
Serial killing in the United States was at its highest between 1970 and 2000, when 70% of recorded serial murders occurred. That era produced the names most people think of when the subject comes up. Rates of serial killings have been on the decline since the 1990s.
The scale of that decline is striking. According to the Radford University Serial Killer Database, the number of serial killers in the US increased by a factor of 10 between the 1940s and the 1970s, then just as quickly dissipated, crashing roughly 80% from its peak by the 2010s. James Alan Fox, the Lipman Family Professor of Criminology, Law and Public Policy at Northeastern University, has identified multiple structural explanations for that drop, noting that general homicide rates and social conditions from the 1960s through the 1990s contributed to the peak era.
In earlier decades, people traveled long distances with less information and fewer ways to communicate, making contact with unfamiliar strangers more common. Hitchhiking and roadside assistance from strangers were widely accepted, giving serial killers more opportunity to strike undetected. Mobile phones, rideshare apps, and near-ubiquitous surveillance cameras have changed that calculus entirely.
Technology also changed how investigators catch killers who do continue operating. Massively parallel sequencing can analyze thousands of DNA markers, enabling the identification of criminals who would have remained undetected under older forensic methods. Genealogy databases have extended that reach further, allowing investigators to identify suspects through the DNA of distant relatives. The average time to detect a serial killer is 8 years, according to FBI data on violent crime, but that window is narrowing as forensic tools improve.
Approximately 60% of serial killers are caught due to a break in the case, such as a weapon found or a witness identification. The other 40% are caught through accumulated evidence, investigative persistence, or the kind of database-driven forensic genealogy that simply didn’t exist two decades ago.
The Numbers Today
There is no confirmed official count of active serial killers in the US. Some media sources have cited estimates suggesting there may be 25 to 50 active serial killers in the United States at any given time, though the FBI has stated that the true number cannot be quantified.
Serial killings are rare, accounting for less than 1% of total homicides. California carries the heaviest historical burden of any state: data indicates that California ranks highest in sheer volume of serial killer victims, with 1,777 documented cases. That concentration reflects population density, geographic mobility, and the presence of large transient communities – conditions that have historically made victim disappearances harder to connect.
Read More: U.S. States Where The Most Psychopaths Are Likely To Live
What This Means for You
The gap between the United States and every other country in documented serial killers is real, but its causes are layered. Part of it reflects a genuine cultural environment – a history of domestic violence, media glamorization of violence, and social conditions that produced a peak era of serial crime between the 1970s and 1990s. Part of it reflects something less alarming: America is simply better than most countries at identifying, investigating, and recording these crimes.
The practical takeaway isn’t fear. Serial killings account for less than 1% of total homicides, making them statistically rare despite their outsized presence in culture. The conditions Dr. Hickey identifies – media glorification, domestic violence, social isolation – are modifiable. The 80% decline since the peak period shows that structural change works. Better forensic technology, reduced opportunities for predatory stranger encounters, and improved institutional coordination have all contributed to a genuine reduction in one of the most disturbing categories of violent crime. That progress is worth knowing about, even when it goes unreported.
AI Disclaimer: This article was created with the assistance of AI tools and reviewed by a human editor.