Roughly half of all murders in the United States go unsolved. The most recent federal data, covering 2023, shows that only about 47% of homicide cases were cleared by arrest, which means around 53% produced no arrest at all. That is the short answer to what percentage of murders go unsolved in America, and it reflects a steep drop from the early 1960s, when police solved more than nine out of every ten homicides.
The Bureau of Justice Statistics estimated 19,800 homicide victimizations nationwide in 2023. With a clearance rate of roughly 47%, well over 10,000 of those killings produced no arrest in that year alone.1Bureau of Justice Statistics. Homicide Victimization in the United States, 2023 The Council on Criminal Justice placed the 2022 clearance rate at about 50%, so this isn’t a one-year anomaly.2Council on Criminal Justice. Trends in Homicide: What You Need to Know The clearance rate has sat near or below 50% since around 2020, and every year at that level adds thousands more cases to the national backlog of unsolved homicides.
What “Unsolved” Really Means in the Data
A homicide is counted as “cleared by arrest” when three things happen together: at least one person is arrested, that person is formally charged with the offense, and they are turned over to the court for prosecution.3Federal Bureau of Investigation. Crime in the U.S. 2017 – Clearances If any step is missing, the case stays in the unsolved column no matter how much investigators know.
A smaller category called “cleared by exceptional means” covers cases where police have identified and located the suspect but cannot make an arrest. Common scenarios include the suspect dying before arrest, a victim refusing to cooperate, or another jurisdiction denying extradition. Even an exceptional clearance requires enough evidence to support an arrest and the suspect’s exact location.4Federal Bureau of Investigation. Crime in the U.S. 2010 – Offenses Cleared
One important point: “cleared” does not mean “convicted.” A case is cleared the moment an arrest and charges happen. If prosecutors later drop the charges or a jury acquits, the case still counts as cleared in FBI statistics. The Council on Criminal Justice found that in 2022, just half of murders resulted in an arrest and fewer than half resulted in a conviction.2Council on Criminal Justice. Trends in Homicide: What You Need to Know So the share of murders where someone is actually held accountable through a completed prosecution is lower than the 47% clearance figure.
How the Unsolved Rate Got So High
The current 47% clearance rate would have been almost unthinkable sixty years ago. In 1962, the FBI reported a national homicide clearance rate of 93%. By 1994, the national rate had fallen to 64%, where it roughly plateaued for the next 25 years before dropping sharply again around 2020.5Annual Reviews. The Sixty-Year Trajectory of Homicide Clearance Rates: Toward a Better Understanding of the Great Decline As recently as 2019, the FBI reported a 61.4% clearance rate, so the drop into the 40s happened quickly.6Federal Bureau of Investigation. Crime in the U.S. 2019 – Clearances
Why So Many Murders Go Unsolved Today
Researchers point to several reinforcing factors rather than a single cause.
The biggest driver is a shift in what criminologists call “solvability,” meaning how inherently difficult the average homicide is to solve. In the 1960s, most murders grew out of arguments between people who knew each other, typically family members, romantic partners, or friends. Witnesses were often present and the suspect was obvious. Today a much larger share of homicides involve strangers, drug markets, or gang conflicts where witnesses are scarce and nobody cooperates with investigators. Domestic homicides have declined as a share of the total, and the cases replacing them are far harder to crack.5Annual Reviews. The Sixty-Year Trajectory of Homicide Clearance Rates: Toward a Better Understanding of the Great Decline
Witness cooperation is a second piece. Research has found that both actual and perceived clearance rates significantly affect whether community members will call police after witnessing a homicide or share information about a suspect. In neighborhoods where people believe police rarely solve murders, cooperation drops, which makes it harder to solve the next one. The pattern hits racially and ethnically diverse neighborhoods disproportionately affected by violence the hardest.
Caseload pressure matters too. When homicide counts spike, detectives carry more open cases at once, and each case gets less attention. The sustained investigative effort after the first 48 hours is what typically separates solved cases from unsolved ones, and that effort shrinks when detectives are stretched thin.
Which Murders Are Most Likely to Go Unsolved
The Relationship Between Victim and Killer
The single strongest predictor of whether a homicide will be solved is whether the victim and killer knew each other. Murders involving family members or intimate partners clear at significantly higher rates than the national average because the suspect pool is small and the motive is usually apparent. When a homicide involves strangers or grows out of other criminal activity, clearance rates drop sharply. FBI data from 2019 showed the relationship between victim and offender was unknown in nearly 49% of homicide incidents, a marker that tracks closely with unsolved cases.7Federal Bureau of Investigation. Crime in the U.S. 2019 – Expanded Homicide
The Weapon Used
Firearms are involved in the majority of U.S. homicides, and gun murders are among the hardest to clear. One Department of Justice study found a 43% clearance rate for gun murders, well below the national average for homicides overall.8Office of Justice Programs. Why Do Gun Murders Have a Higher Clearance Rate Than Gunshot Assaults Close-contact methods like knives or physical force tend to leave more physical evidence linking the attacker to the victim.
Where the Killing Happened
Homicides inside private residences are more likely to be solved than those in public outdoor spaces. Indoor scenes tend to preserve physical evidence and are more likely to have witnesses nearby. Killings in open or secluded areas, particularly those tied to drug transactions or other criminal activity, leave investigators with less to work with.
Who the Victim Was
Clearance rates are not evenly distributed across demographics. Data has consistently shown that homicides with Black victims are significantly less likely to be solved than those with white victims. In one analysis, police were unable to identify key traits of the offender in roughly 40% of homicides with Black victims, nearly double the rate for white victims. The disparity reflects compounding factors: strained relationships between police and the neighborhoods most affected by violence, a higher share of hard-to-solve case types in those communities, and uneven allocation of investigative resources.
The Cold Case Backlog and Newer Tools
The backlog of unsolved homicides now stretches back decades. Every year that roughly half of murders go uncleared adds thousands more cases to the pile. Advances in forensic technology have given investigators new ways to revisit old evidence.
The National Institute of Justice runs a program called “Solving Cold Cases with DNA,” which helps law enforcement agencies analyze biological evidence from old crime scenes using modern techniques. Samples that were previously considered too degraded, too small, or otherwise unusable can now often yield usable genetic profiles.9National Institute of Justice. Cold Case Investigations
Investigative genetic genealogy, which combines DNA evidence with public genealogy databases to identify suspects through their relatives, first drew national attention with the 2018 arrest of the Golden State Killer, Joseph DeAngelo. By the end of 2022, the technique had been used to solve over 500 cases, many of them cold for years or decades. It works particularly well on the types of crimes that have been hardest to clear: stranger attacks, serial violence, and cases with no surviving witnesses.
These tools chip away at the backlog one case at a time. They don’t address the structural problems driving the clearance rate down in the first place. Until investigative resources, community trust, and witness cooperation improve, the share of murders going unsolved each year is unlikely to change much from the roughly one-in-two figure it sits at today.