Between 17 and 22 percent of documented serial murder victims in the United States are sex workers, a rate that reflects not random victimization patterns but deliberate target selection by offenders who understand how institutions will respond to the deaths. Criminologist Steven Egger named this dynamic in 2002: some victims are “less dead” than others, meaning their deaths generate less investigative urgency, less public attention, and less institutional resource allocation. The structural conditions that make sex workers disproportionately vulnerable to serial violence are the same conditions that slow the investigative response when those killings occur. Prior arrest records delay missing person investigations. Social networks are assumed to accommodate unexplained absences. Cases are processed rather than pursued. Killers who understand this operate in the margin it creates. The Detroit rape kit backlog confirmed what individual cases had suggested for decades: when Wayne County Prosecutor Kym Worthy noted that 86.3 percent of the victims in those 11,341 untested kits were non-white, she was describing an institutional calculus that had never been hidden. What was missing was the will to name it.
Research on serial homicide patterns places sex workers as victims in 17 to 22 percent of documented cases. Criminologist Steven Egger’s documented analysis suggests the proportion may be higher, reaching approximately 78 percent of female serial murder victims. The discrepancy reflects measurement differences and case identification challenges, not an absence of the phenomenon.
The investigative response gap is not simply a byproduct of under-resourced departments. It is structurally built into how missing persons cases are categorized, how prior arrest records interact with investigative prioritization, and how serial patterns are identified across cases that are processed rather than actively connected.
The John Eric Armstrong case, covered in this series, documented the gap in real time: Armstrong operated on Michigan Avenue in Detroit for at least four months between his first confirmed killing and his arrest. During that period, the investigative infrastructure for the population he was targeting was operating at routine pace rather than urgent response.
The Washington Post’s 2018 analysis of more than 52,000 homicides across the United States identified geographic areas described as “pockets of impunity” where killings were common but arrests were rare. These concentrations correlated significantly with neighborhoods where socially marginalized populations lived and worked.
Michigan’s legislative response to the rape kit backlog produced measurable reforms. The investigative response gap for homicides involving sex workers has not received comparable legislative attention in Michigan or most other states.
The Term and What It Documents
In 2002, criminologist Steven Egger published his analysis of what he called the “less dead”: marginal populations whose deaths attract reduced investigative response and social resources relative to victims with more conventional social profiles. The term was not an argument about the moral value of human life. It was a description of how institutions actually behave.
The populations Egger identified include sex workers, drug users, migrant workers, and others whose social position places them outside the protected center of the investigative imagination. They are people whose disappearances are assumed to have explanations. People whose absence is tolerated before it becomes a case. People whose cases, once opened, are processed with less urgency than cases involving victims whose lives map more closely to what the investigative infrastructure was designed to protect.
This is documented behavior, not theoretical. It appears in clearance rate data, in case connection timelines, and in the words of the investigators and prosecutors who have reflected on why killers like Gary Ridgway, John Eric Armstrong, and Samuel Little were able to operate for years before being identified. Ridgway told investigators he targeted sex workers because he knew they would not be reported missing quickly. Armstrong’s victims on Michigan Avenue were connected to a pattern only after he had been operating on that corridor for months. Samuel Little, who confessed to 93 murders across multiple decades, targeted predominantly Black women, sex workers, and drug users because, in his own words, he knew no one would be looking.
The “less dead” framework does not explain why individual investigators make individual choices. It describes a structural reality in which the cumulative weight of institutional practices creates a population that is easier to target and harder to find justice for. That reality is the subject of this piece.
What the Research Shows
Estimates of sex workers as a proportion of serial murder victims range across studies from 12.5 percent to 22 percent, using data from the mid-twentieth century through the 2000s. Egger’s own analysis reached a higher figure, approximately 78 percent of female serial murder victims, though that figure reflects methodological and definitional differences from studies that used more restricted datasets. The consistent finding across studies is that sex workers appear in serial murder victim profiles at rates substantially higher than their proportion of the general population.
The research also documents the deliberate targeting dynamic. Some offenders explicitly state that they selected sex workers because of the reduced investigative response their deaths would generate. This is not forensic speculation. It is documented in confessions, in trial testimony, and in post-conviction interviews. The calculus is not hidden. Killers who target these populations understand that the margin of safety they gain comes directly from institutional disinterest in their victims’ welfare.
Homicide clearance rates in the United States have declined from approximately 70 to 75 percent in the 1970s to a national average of roughly 50 to 60 percent in recent years. Within that declining average, clearance rates vary substantially by victim characteristics. Research consistently identifies victim-offender relationship, victim social status, and the presence or absence of witness contact as clearance predictors. Stranger-perpetrated homicides of victims with prior criminal records, involving victims who are not promptly reported missing, and in neighborhoods characterized by reduced police-community cooperation are among the least likely to produce arrests. Sex worker homicides frequently share all of these characteristics simultaneously.
The Michigan Avenue Pattern
The Armstrong case, covered in this series, is the most documented Michigan example of what this gap produces in practice. John Eric Armstrong killed five women in the Detroit metropolitan area between December 1999 and April 2000. All five had prior arrest records for soliciting. All five were identified through fingerprints. The interval between Monica Johnson’s death in December 1999 and the discovery of three bodies in the railroad yard in April 2000 was approximately four months.
During that four months, Armstrong drove a distinctive black Jeep Wrangler with a personalized “Baby Doll” front license plate along Michigan Avenue, a known corridor where sex workers worked. He was not invisible. He was operating in a space where the investigative infrastructure was not designed to connect the cases he was building.
The gap is not primarily a story about individual investigative failures. Investigators working the early cases worked them under the standard resource allocation and prioritization structures of a department that processed many cases. The gap is that the standard resource allocation and prioritization structures were calibrated to a different population than the one Armstrong was targeting. Those structures did not flag the pattern because the pattern was happening in a population that the structures were not optimized to monitor.
After Armstrong’s arrest, Detroit Police Department Inspector Don Johnson told reporters that investigators could “clearly see” the consistency of the pattern once they were looking for it. The point the Armstrong record illustrates is when they started looking, not that they eventually found him.
What the Rape Kit Backlog Confirmed
In August 2009, Rob Spada, chief of the Wayne County Prosecutor’s Special Victims Unit, was in a Detroit Police Department warehouse searching for ballistic evidence when he noticed boxes on steel shelving. They were rape kits. He asked whether they were tested or untested. He was told the office did not know. He opened boxes and saw that the seals on the kits had not been broken. The kits had not been tested. There were approximately 11,000 of them.
The final count was 11,341 sexual assault kits, collected by DPD between 1984 and 2009. The majority had never been submitted for DNA analysis. They had been collected, documented, sealed, and placed in a warehouse where they sat for periods ranging from months to more than two decades.
Wayne County Prosecutor Kym Worthy, who led the initiative to test all of the kits and investigate the resulting leads, has noted that 86.3 percent of the victims represented in those kits were non-white. The kits ultimately identified 853 serial rapists and led to 257 convictions. The rapists identified had connections to crimes in 39 additional states. The testing revealed that some of the same men had raped multiple women over years, in some cases decades, while their victims’ kits sat in sealed boxes.
Worthy has stated the institutional dynamic plainly: the case got solved if the victim was perceived as the kind of person whose case deserved to be solved. The rape kit warehouse did not create this dynamic. It made it visible in a way that could not be dismissed.
What makes sex workers disproportionately targeted: Repeated contact with strangers in low-surveillance environments; reduced likelihood of prompt missing persons reports; prior arrest records that interact with institutional response patterns; social networks that may be less engaged with law enforcement.
What makes the investigative response slower: Missing persons cases are categorized with assumptions about voluntary absences; prior records create processing-forward rather than investigation-forward responses; cases must be actively connected across units and jurisdictions, a step that requires someone to be looking for the pattern.
What this produces: A documented, extended operating window for killers who understand and exploit these conditions. The Armstrong active period was at minimum four months. Gary Ridgway operated for approximately twenty years. The duration correlates with the depth of the institutional gap.
When a pattern of institutional failure affects a specific population, documenting that pattern is the first step toward making it visible. This guide builds a structured tracking system for case handling disparities, response delays, and the paper trail that accountability requires.
The Missing Case Connection Problem
Serial killers who target sex workers often operate across jurisdictions, across police precincts, or across shifts and units within the same department. The cases that appear unconnected are frequently connected. The tool that would make the connection, an active cross-case pattern review of homicides involving victims with similar profiles in similar geographic areas, requires that someone has allocated resources toward the review and that the review is actively occurring rather than waiting to be triggered by a new case.
Armstrong’s victims were in both Detroit and Dearborn Heights, though the full pattern was not connected across those jurisdictions during his active period. Green River Killer Gary Ridgway exploited a similar dynamic: his victims disappeared from corridors in the Seattle and Tacoma areas over years before investigators assembled a working portrait of a single ongoing serial case. The geographic spread was not large, but the investigative posture toward the missing persons cases, each of which involved women with prior arrest records for soliciting, was not one of active pattern-seeking.
The case connection problem is not unsolvable. It requires investment in proactive pattern analysis rather than reactive case response. In serial homicide investigations involving victims whose social position does not trigger urgent response, that investment is frequently not made until the body count is established enough to force it.
What Reform Has and Has Not Done
Michigan’s legislative response to the rape kit backlog produced concrete reforms. State law now requires that rape kits be submitted for DNA analysis within a defined timeframe. The testing initiative has closed more than 4,800 cases and identified 853 serial rapists. These are real outcomes produced by deliberate policy change.
The investigative response gap for sex worker homicides has not received comparable legislative attention. No Michigan statute requires that homicide cases involving victims with prior soliciting arrests be reviewed for pattern connections within a defined timeframe. No state policy mandates the allocation of investigative resources specifically toward the population most disproportionately represented in serial murder victim profiles.
What exists is the standard of investigative practice, which reflects what has always existed: the population that gets urgent response is the population that the institution is designed to serve. When that population does not include sex workers, the gap between homicides that get solved and homicides that define an active killer’s operating window remains open.
The people who live in that gap have names. So do the killers who operate in it, once someone finally starts looking.
The Detroit rape kit backlog produced legislative reform on sexual assault kit processing timelines. The investigative response gap that allowed John Eric Armstrong to kill five women over four months in a distinctive vehicle on a named corridor in Detroit, that allowed Gary Ridgway to kill for approximately twenty years, that allowed Samuel Little to confess to 93 murders before he died in custody, has not produced comparable legislative attention in Michigan or in most other states. The pattern is documented. The structural conditions are documented. The gap between documentation and reform is the current policy position.
Why are sex workers disproportionately targeted by serial killers?
Criminological research identifies several documented factors. The nature of street-based sex work involves repeated contact with strangers in low-surveillance environments where witness identification is unlikely. Missing person reports are often delayed. Prior arrest records interact with institutional response patterns in ways that slow investigation. Documented confessions from serial offenders confirm that some killers explicitly selected sex workers because they understood this institutional gap and exploited it as an operational margin.
What does “less dead” mean in a criminological context?
“Less dead” is a term coined by criminologist Steven Egger in 2002 to describe marginal victim populations whose deaths receive reduced investigative response and social resources compared to victims with more conventional social profiles. The term encompasses sex workers, drug users, migrant workers, and others whose social position shapes how institutions respond to their deaths. The concept describes institutional behavior, not individual culpability.
What did the Detroit rape kit backlog reveal about institutional prioritization?
When 11,341 untested rape kits were discovered in a DPD warehouse in 2009, Wayne County Prosecutor Kym Worthy noted that 86.3 percent of the victims were non-white. Testing ultimately identified 853 serial rapists with connections to 39 other states. Worthy has stated that the pattern reflected a calculus about whose cases were pursued. The backlog documented in physical form a priority structure that had been operating for decades.
What investigative reform would specifically address the sex worker homicide gap?
Documented recommendations from researchers and practitioners include: mandatory proactive cross-case pattern review for homicides involving victims with prior soliciting arrests, rather than reactive connection only after multiple deaths are established; dedicated investigative resources for street-based violence cases regardless of victim history; and standardized liaison structures between sex worker communities and law enforcement designed to produce earlier reporting. None of these have been enacted in Michigan law.
Bluebook: Williams, Rita. Less Dead: The Investigative Response Gap for Sex Worker Homicides and the Documented System Behind It, Clutch Justice (July 19, 2026), https://clutchjustice.com/2026/07/19/sex-worker-homicide-investigative-gap-less-dead-institutional-response/.
APA 7: Williams, R. (2026, July 19). Less dead: The investigative response gap for sex worker homicides and the documented system behind it. Clutch Justice. https://clutchjustice.com/2026/07/19/sex-worker-homicide-investigative-gap-less-dead-institutional-response/
MLA 9: Williams, Rita. “Less Dead: The Investigative Response Gap for Sex Worker Homicides and the Documented System Behind It.” Clutch Justice, 19 July 2026, clutchjustice.com/2026/07/19/sex-worker-homicide-investigative-gap-less-dead-institutional-response/.
Chicago: Williams, Rita. “Less Dead: The Investigative Response Gap for Sex Worker Homicides and the Documented System Behind It.” Clutch Justice, July 19, 2026. https://clutchjustice.com/2026/07/19/sex-worker-homicide-investigative-gap-less-dead-institutional-response/.
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