A murder conviction in the United States can send someone to prison for anywhere from a handful of years to the rest of their life, and in some cases to death row. How many years in prison for murder depends on the degree of the charge, the state or federal jurisdiction handling the case, and the specific facts the judge or jury weighs at sentencing. First-degree murder almost always means life in prison. Second-degree murder typically runs from about 15 years up to life. Manslaughter, which is a lesser homicide charge, can carry sentences as short as three years.
First-Degree Murder
First-degree murder is the most serious homicide charge, reserved for killings that are intentional, deliberate, and premeditated. A conviction almost always produces a life sentence.
In states that allow parole for first-degree murder, the defendant becomes eligible for a parole hearing after serving a minimum number of years. That minimum typically falls between 15 and 30 years, though some states push it to 40 or 50. For the most serious cases, courts impose life without the possibility of parole, which means the person will die in prison.
Twenty-seven states currently authorize the death penalty, though four of those have paused executions through executive action. Capital punishment is reserved for first-degree murders involving specific aggravating circumstances, such as killing multiple people, targeting a child, or committing the murder during another serious felony. A jury, not the judge, decides whether a death sentence is appropriate. Under federal law, first-degree murder carries either life imprisonment or the death penalty.1Office of the Law Revision Counsel. 18 USC 1111 – Murder
One point worth knowing: you don’t have to personally kill anyone to face a first-degree murder charge. Under the felony murder rule, if someone dies during the commission of a dangerous felony like robbery, arson, or kidnapping, everyone involved in that felony can be charged with murder. A few states, including Hawaii and Kentucky, have abolished the rule, and others such as California and Illinois have narrowed it in recent years.
Second-Degree Murder
Second-degree murder covers intentional killings that happen without premeditation, along with so-called depraved heart killings where someone acts with such extreme recklessness that death is foreseeable. Firing a gun into a crowd is the textbook example.
Sentences are severe but carry more flexibility than first-degree. Under federal law, a second-degree murder conviction can bring any term of years up to life in prison.1Office of the Law Revision Counsel. 18 USC 1111 – Murder State ranges vary widely. Some states set a minimum as low as five years with a maximum of life. Others impose structured ranges like 16 to 48 years. In practical terms, most second-degree murder convictions produce at least 15 years in prison, with many landing at 25 years or more.
Manslaughter
Manslaughter is an unlawful killing without the deliberate intent that defines murder. Sentences are substantially lighter, and the law splits manslaughter into two categories that work very differently.
Voluntary Manslaughter
Voluntary manslaughter applies when someone kills intentionally but in response to a provocation that would cause a reasonable person to lose self-control. The classic example is a spouse who discovers their partner in bed with someone else and kills in a sudden rage. Courts have also recognized mutual combat and serious physical assaults as adequate provocation. The emotional response has to be immediate and overwhelming; mere insults almost never qualify.
Federal law caps voluntary manslaughter at 15 years in prison.2Office of the Law Revision Counsel. 18 USC 1112 – Manslaughter State penalties range from as low as three years to as high as 15, with most falling somewhere in that band.
Involuntary Manslaughter
Involuntary manslaughter is an unintentional killing caused by criminal negligence or recklessness. A fatal drunk-driving crash, a death caused by reckless handling of a firearm, or a fatality from grossly negligent medical treatment can all fall under this charge.
Federal law sets the maximum at eight years.2Office of the Law Revision Counsel. 18 USC 1112 – Manslaughter State penalties are all over the map. Some states treat it as a lower-level felony with a five-year cap. Texas allows up to 20 years for reckless killings. Washington State permits sentences up to life imprisonment in some reckless homicide cases. The state where the offense happened matters enormously here.
Attempted Murder
When someone tries to kill another person but the victim survives, the charge is attempted murder. The sentence is lighter than for a completed killing but still severe. Federal law allows up to 20 years.3Office of the Law Revision Counsel. 18 USC 1113 – Attempt to Commit Murder or Manslaughter Under the federal sentencing guidelines, the base offense level is 33 when the intended crime would have been first-degree murder and 27 for other cases.4United States Sentencing Commission. 2018 Chapter 2 A-C – Chapter Two – Offense Conduct State sentences commonly fall between 10 and 30 years, and some states allow life imprisonment for the most egregious attempts.
What Moves a Sentence Up or Down
A conviction doesn’t automatically produce a fixed number of years. The judge weighs the circumstances of the crime and the background of the defendant to decide where in the legal range the sentence falls.
Aggravating factors push the sentence higher. They include:
- A vulnerable victim, meaning someone very young, elderly, or disabled
- A victim who was a police officer, firefighter, or other public servant on duty
- A prior record of violent crime
- A financial motive, such as insurance proceeds or payment for a killing
- Exceptional cruelty, such as torture or prolonged suffering
Mitigating factors can bring the sentence closer to the minimum:
- The defendant’s youth, though still legally an adult
- No prior criminal record
- Duress or significant coercion from another person
- Diminished capacity from mental illness or intellectual disability that falls short of an insanity defense
- A minor role in a case with multiple defendants
In death penalty cases these factors do even more work. A jury has to find that the aggravating circumstances substantially outweigh the mitigating ones before a death sentence can be imposed.
How Much of the Sentence Is Actually Served
A 30-year sentence rarely means 30 years for most offenses, because prison systems hand out credits for good behavior and program participation. Murder is the big exception.
In the federal system, the First Step Act allows many inmates to earn time credits toward earlier release, but people convicted of murder are specifically excluded.5Federal Bureau of Prisons. Disqualifying Offenses Manslaughter and attempted manslaughter convictions are not disqualified, but any federal homicide classified as murder is.
Most states impose similar restrictions. Many require murder defendants to serve 85% or more of their sentence before any release consideration, and some impose mandatory minimums that no amount of good behavior can touch. The practical result: people convicted of murder serve a much higher percentage of their stated sentence than people convicted of most other crimes.
Juvenile Murder Sentencing
When a minor is charged with murder and tried as an adult, the sentencing rules change. The Supreme Court held in 2012 that mandatory life-without-parole sentences for juvenile homicide offenders violate the Eighth Amendment’s ban on cruel and unusual punishment.6Justia Law. Miller v. Alabama, 567 U.S. 460 (2012) The Court reasoned that children differ from adults in maturity, susceptibility to pressure, and capacity for change, and that mandatory sentencing kept judges from accounting for those differences.
The ruling does not forbid life without parole for juveniles entirely. It requires a sentencing hearing where the defendant’s youth and its characteristics are meaningfully considered. In 2021 the Court clarified that judges do not have to make a specific finding that the juvenile is permanently beyond rehabilitation; they just need discretion to impose something less. The 2012 rule also applies retroactively, so people who received mandatory life-without-parole sentences as juveniles before 2012 are entitled to new sentencing hearings or parole consideration.
Federal vs. State Prosecution
The vast majority of murder cases are prosecuted in state court under state law. Murder becomes a federal crime only when a specific federal interest is involved, such as the killing of a federal official, a murder on federal property like a military base or national park, a killing connected to terrorism or organized crime, or a death caused during a bank robbery.
Federal first-degree murder carries death or life imprisonment. Federal second-degree murder carries any term of years up to life.1Office of the Law Revision Counsel. 18 USC 1111 – Murder Because state sentencing laws vary so widely, the same conduct can carry stiffer penalties federally in some states and lighter ones in others. The jurisdiction that prosecutes makes a real difference in the number of years on the sentence.