Roper v. Simmons
The Supreme Court ruled that executing anyone for a crime committed before age 18 violates the Constitution's ban on cruel and unusual punishment, overturning its own 1989 decision that had allowed such executions.
The 5-4 ruling means the roughly 70 people then on death row for crimes committed as teenagers cannot be executed, and it permanently bars states from seeking the death penalty against juvenile offenders going forward.
“The Eighth and Fourteenth Amendments forbid imposition of the death penalty on offenders who were under the age of 18 when their crimes were committed.”
The Court's central holding barring the death penalty for juvenile offenders.
How it got here: Missouri courts and federal habeas courts upheld Simmons' death sentence, but the Missouri Supreme Court later set it aside relying on this Court's Atkins decision, prompting the State's appeal here.
The Case in Depth
What happened
At 17, Christopher Simmons planned and carried out the murder of Shirley Crook, breaking into her home with a younger accomplice, binding her, and throwing her off a bridge to drown. He was convicted and sentenced to death as an adult. After the Supreme Court later barred executing the mentally retarded, Simmons argued the same reasoning should bar executing people who were minors when they killed.
The question before the Court
Can a state execute someone for a murder they committed when they were 16 or 17 years old?
The Court's answer
No — the Court ruled that the Eighth and Fourteenth Amendments forbid executing anyone for a crime committed before turning 18. The Court found that a majority of states had already rejected the juvenile death penalty, that its use was rare even where still legally available, and that the trend was consistently toward abolition rather than expansion.
Beyond counting state laws, the Court relied on its own judgment that teenagers as a class are less mature, more vulnerable to outside pressure, and have less fixed characters than adults, making it unreliable to treat even a heinous teenage murderer as deserving the ultimate punishment. It also noted that the United States stood alone among nations in officially permitting this practice, which reinforced but did not control the outcome.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
The decision immediately spared dozens of death-row inmates who had committed murder as teenagers, converting their sentences to life imprisonment. It also permanently forecloses death sentences for anyone under 18 nationwide, forcing states like Missouri, Texas, and Virginia to change how they charge and sentence the small number of teenagers who commit the most serious crimes.
What changes now
The ruling is final on the merits, not a temporary order. It converts the death sentences of juvenile offenders nationwide, including Simmons, to life imprisonment, and it bars any future prosecution from seeking a death sentence against someone who was under 18 at the time of the crime. No further proceedings on this question remain; states must continue litigating the boundaries of juvenile sentencing under other doctrines going forward.
What this does not decide
The ruling addresses only the death penalty for offenders under 18; it says nothing about other severe sentences for juveniles, such as life without parole, which the majority explicitly did not question. It also does not disturb the death penalty for adult offenders or for other categories of defendants.
Concurrences and dissents
Concurrence — Justice Stevens
Justice Stevens wrote separately to emphasize that the Eighth Amendment's meaning evolves over time rather than being frozen at ratification, noting that a fixed 1791 reading would permit executing even a seven-year-old. He framed the decision as reaffirming this evolving-standards principle as much as deciding the specific juvenile question.
Dissent — Justice O'Connor
Justice O'Connor agreed with the general framework of weighing legislative consensus and the Court's own moral judgment, but concluded the evidence here was too thin and the pace of legislative change too slow to establish a genuine national consensus, unlike in Atkins. She also argued the differences between individual 17-year-olds are matters of degree, not kind, making a categorical age-based rule too blunt, and would have left the question to case-by-case jury sentencing.
Dissent — Justice Scalia
“By what conceivable warrant can nine lawyers presume to be the authoritative conscience of the Nation?”Scalia's objection to the majority substituting its own moral judgment for that of elected legislatures.
Justice Scalia argued the Court manufactured a national consensus out of a bare minority of states and improperly counted states that had abolished the death penalty entirely as part of that consensus. He objected most strongly to the majority substituting its own moral judgment for legislative judgment and to its reliance on foreign and international law, arguing American constitutional meaning should not be shaped by the views of foreign courts and legislatures.
How the Court got there
The legal reasoning, step by step
- The Court asked whether a 'national consensus' had formed against executing juvenile offenders, the first step in Eighth Amendment analysis that looks at how many state legislatures have banned a punishment and how rarely it is actually used.
- It counted 30 states that barred the juvenile death penalty — 12 that had abolished capital punishment entirely and 18 that kept it but excluded offenders under 18 — and found executions of juvenile offenders had become rare even in states that still allowed them, paralleling the evidence the Court had relied on in Atkins v. Virginia (the 2002 case barring execution of the mentally retarded).
- Beyond counting laws, the Court applied its own independent judgment — a step it said the Constitution requires beyond just tallying legislation — asking whether death is a proportionate punishment given three characteristics of youth: immaturity and recklessness, vulnerability to outside pressure, and an unformed character.
- Because these traits made it unreliable to sort out which teenage offenders were truly the 'worst offenders' deserving of execution, and because they undercut both retribution and deterrence as justifications for the death penalty, the Court concluded a categorical, age-based rule was needed rather than case-by-case jury assessment.
- The Court set the line at 18, the age society already uses for voting, jury service, and marriage without parental consent, reasoning that this is where the law generally draws the boundary between childhood and adulthood.
- Having reached this conclusion, the Court found its earlier decision in Stanford v. Kentucky no longer controlling because the factual basis for that ruling — the state of legislative consensus in 1989 — had changed, and looked to international opinion as confirmation, though not the basis, for its own judgment.
Doctrinal impact
Cases affected by this decision
Overrules Stanford v. Kentucky (492 U.S. 361)
The Court explicitly deemed Stanford no longer controlling and reversed its holding that 16- and 17-year-olds could be executed.
Reaffirms Atkins v. Virginia (536 U.S. 304)
The Court relied heavily on Atkins's reasoning and method for finding a national consensus against a death penalty practice.
Reaffirms Thompson v. Oklahoma (487 U.S. 815)
The Court extended Thompson's ban on executing offenders under 16 to cover all offenders under 18.