The crimes that can send a person to death row in the United States are almost all killings. Federal law, military law, and the roughly 27 states that still authorize capital punishment reserve it for murder committed under specific aggravating circumstances, with a short list of exceptions for offenses against the government itself. Everything else is off the table as a matter of constitutional law.
That boundary is not a policy choice legislators are free to expand. In Kennedy v. Louisiana (2008), the Supreme Court held that capital punishment is unconstitutional for any offense against a person that does not result in the victim’s death, drawing what it called a “sharp line” between lethal and non-lethal crimes.1Justia. Kennedy v. Louisiana, 554 U.S. 407 (2008) The Court recognized one category of exceptions: crimes against the state, such as treason and espionage, where the harm extends beyond any individual victim. A state cannot execute someone for rape, kidnapping, armed robbery, or drug trafficking alone. Someone has to have died.
Federal Crimes That Can Bring a Death Sentence
The Federal Death Penalty Act of 1994, codified at 18 U.S.C. §§ 3591–3599, governs capital cases in federal court.2Office of the Law Revision Counsel. 18 U.S.C. Chapter 228 – Death Sentence Outside the small category of treason and espionage offenses, federal law requires the government to prove beyond a reasonable doubt that the defendant intentionally killed the victim, inflicted serious bodily injury that caused the victim’s death, participated in an act while expecting someone would be killed, or engaged in violence with reckless disregard for human life that directly caused a death.3Office of the Law Revision Counsel. 18 U.S.C. 3591 – Sentence of Death Without one of those four mental states, the case cannot be capital, even if the underlying offense is on the death-eligible list.
Federal offenses that become death-eligible when a victim dies include:
- Murder for hire using interstate commerce or the mail under 18 U.S.C. § 1958.4Office of the Law Revision Counsel. 18 U.S.C. 1958 – Use of Interstate Commerce Facilities in the Commission of Murder-for-Hire
- Federal kidnapping when the victim dies, under 18 U.S.C. § 1201.5Office of the Law Revision Counsel. 18 U.S.C. 1201 – Kidnapping
- Use of a chemical, biological, radiological, or explosive weapon of mass destruction resulting in death, under 18 U.S.C. § 2332a.6Office of the Law Revision Counsel. 18 U.S.C. 2332a – Use of Weapons of Mass Destruction
- Assassination or fatal kidnapping of the President, Vice President, President-elect, or other senior officials in the line of succession, under 18 U.S.C. § 1751.7Office of the Law Revision Counsel. 18 U.S.C. 1751 – Presidential and Presidential Staff Assassination, Kidnapping, and Assault
- Intentional killings committed within a continuing criminal enterprise, and intentional killings of law enforcement officers connected to a federal drug offense, under 21 U.S.C. § 848. A continuing criminal enterprise requires at least three related federal drug violations committed with five or more people, where the defendant served in an organizing or supervisory role and earned substantial income from the operation.8Office of the Law Revision Counsel. 21 U.S.C. 848 – Continuing Criminal Enterprise
The Handful of Crimes That Don’t Require a Death
Four federal offenses can carry the death penalty without proof that anyone was killed. All of them involve harm to the government or to national security.
Treason
Treason is the only crime defined in the Constitution itself. Under 18 U.S.C. § 2381, anyone owing allegiance to the United States who wages war against it or gives aid and comfort to its enemies faces either death or a minimum of five years in prison and a $10,000 fine.9Office of the Law Revision Counsel. 18 U.S.C. 2381 – Treason No one has been executed for treason since the Civil War era, but the statute remains in force.
Espionage
Transmitting national defense information to a foreign government can bring a death sentence under 18 U.S.C. § 794, but only in limited circumstances. Death is available if the espionage led a foreign power to identify a U.S. intelligence agent who was then killed, or if the information concerned nuclear weapons, military satellites, early warning systems, war plans, or other major elements of defense strategy.3Office of the Law Revision Counsel. 18 U.S.C. 3591 – Sentence of Death Passing classified material outside those categories remains a serious crime but cannot lead to execution.
State Capital Murder
Every state that retains the death penalty limits it to first-degree murder committed with at least one statutory aggravating factor. A garden-variety intentional killing is not enough. Prosecutors have to prove a specific circumstance that lifts the crime above ordinary homicide.
The lists vary by state, but a common core appears in most jurisdictions:
- Killing a law enforcement officer or first responder on duty.
- Murder of a child, usually below an age threshold such as 12 or 14.
- Killing two or more people in one episode or as part of a pattern.
- A death that occurs during another dangerous felony, such as robbery, arson, kidnapping, or sexual assault.
- Killing for financial gain, insurance proceeds, or other pecuniary benefit.
- Killing a witness, juror, or anyone else to avoid arrest or obstruct prosecution.
- Murder committed in an especially heinous or cruel manner, involving torture or prolonged suffering.
- A defendant with prior violent felony convictions.
Even when a jury finds one or more of these aggravators, it must weigh them against mitigating evidence the defense presents, such as the defendant’s age, mental health history, lack of a prior record, or minor role in the offense. No state permits a death sentence based on aggravating factors alone.
Felony Murder and How Far Participation Has to Go
The felony murder rule allows a murder charge against anyone involved in a dangerous felony if someone dies during the crime, even when that person did not personally kill or intend a killing. In death-penalty states, a felony murder conviction can technically qualify as capital when the right aggravators are present. The Supreme Court has drawn firm limits on how far that can go.
In Enmund v. Florida (1982), the Court held that a getaway driver who did not kill, attempt to kill, or intend that a killing take place could not constitutionally be executed, because the death penalty must match the defendant’s personal moral responsibility.10Justia. Enmund v. Florida, 458 U.S. 782 (1982) Five years later, Tison v. Arizona (1987) allowed the death penalty for a defendant who played a major role in the underlying felony and acted with reckless indifference to human life, even without a specific intent to kill.11Justia. Tison v. Arizona, 481 U.S. 137 (1987) The line between those two cases is where most felony-murder capital fights happen: how deeply the defendant was involved and how aware they were of the risk.
Military Capital Offenses
The Uniform Code of Military Justice authorizes the death penalty for a set of offenses that overlaps only partly with civilian federal law. Premeditated murder and felony murder are death-eligible under UCMJ Article 118, covering killings committed with premeditated design or during the commission of crimes like robbery, sexual assault, or aggravated arson.12Office of the Law Revision Counsel. 10 U.S.C. 918 – Art. 118. Murder
Several purely military offenses also carry the death penalty in both wartime and peacetime, including mutiny, sedition, misbehavior before the enemy such as cowardice under fire, espionage, and aiding the enemy. Others, including desertion and assaulting a superior officer, are capital only during wartime. A military death sentence requires a panel of at least 12 members, and the vote must be unanimous.
Who Cannot Be Executed Even When the Crime Qualifies
The Constitution takes certain defendants off the table regardless of the offense. If any of these apply, the crime may still be prosecuted as capital in name, but a death sentence cannot lawfully be carried out.
Anyone Under 18 at the Time of the Crime
In Roper v. Simmons (2005), the Supreme Court held that the Eighth and Fourteenth Amendments forbid the death penalty for anyone who was younger than 18 when the offense occurred.13Justia. Roper v. Simmons, 543 U.S. 551 (2005) Federal law says the same: 18 U.S.C. § 3591 bars a death sentence for anyone under 18 at the time of the offense.3Office of the Law Revision Counsel. 18 U.S.C. 3591 – Sentence of Death
Defendants With Intellectual Disability
In Atkins v. Virginia (2002), the Court ruled that executing someone with an intellectual disability violates the Eighth Amendment.14Justia. Atkins v. Virginia, 536 U.S. 304 (2002) The Court left the clinical criteria to individual jurisdictions, which has produced ongoing litigation over where exactly the line falls.
Prisoners Who Are Incompetent to Be Executed
Under Ford v. Wainwright (1986), the Eighth Amendment bars executing a prisoner who has become so mentally ill that they cannot understand the punishment or the reason it is being imposed.15Justia. Ford v. Wainwright, 477 U.S. 399 (1986) The rule does not stop a court from imposing the sentence. It stops the execution from going forward while the prisoner remains incompetent, and if competency is later restored, the sentence can be carried out.