A second-degree murder conviction typically carries 15 years to life in prison, though the exact term depends on whether the case is prosecuted in state or federal court, the defendant’s criminal history, and whether aggravating factors like firearm use are involved. How much time you get for second-degree murder in any individual case is driven far more by those variables than by the raw statutory range. Most homicides are prosecuted under state law, and state ranges vary enormously — some set a floor near 10 years, others authorize life from the outset.
State Sentencing Ranges
Because most second-degree murder cases are handled in state court, state law controls the sentence for the overwhelming majority of defendants. The ranges are all over the map. Some states set a presumptive term around 16 years with a range of roughly 10 to 25 years. Others authorize 15 years to life, meaning the defendant serves at least 15 years and then becomes eligible for parole. A handful allow sentences from as few as 5 years to as many as 99 years or life. At least one state doesn’t formally distinguish between first and second-degree murder at all, collapsing both into a single offense with a range stretching from 5 years to life.
The general pattern: a floor somewhere between 10 and 25 years and a ceiling that often reaches life imprisonment. Where a sentence lands within that span depends on the aggravating and mitigating factors discussed below. State sentencing structures also differ in format. Some use determinate sentences (a fixed number of years); others use indeterminate sentences (a range like “15 years to life”) where a parole board eventually decides release.
Federal Sentencing for Second-Degree Murder
Federal murder charges under 18 U.S.C. 1111 only apply within “special maritime and territorial jurisdiction,” which covers federal property, military installations, national parks, vessels at sea, and aircraft over international waters.1Office of the Law Revision Counsel. 18 USC 7 – Special Maritime and Territorial Jurisdiction of the United States If the killing happened in an ordinary city or town with no federal hook, state rules control instead.
Where federal law does apply, the statute sets the penalty at “any term of years or for life.”2Office of the Law Revision Counsel. 18 USC 1111 – Murder The U.S. Sentencing Guidelines narrow that discretion by assigning second-degree murder a base offense level of 38.3United States Sentencing Commission. Annotated 2025 Chapter 2 C
The sentencing table then converts that offense level into a recommended prison range based on the defendant’s criminal history category. For a first-time offender at level 38, the guideline range is 235 to 293 months — roughly 20 to 24 years. A defendant with an extensive record (Category VI) faces 360 months to life, meaning 30 years at a minimum.4U.S. Sentencing Commission. Sentencing Table Judges can depart from these ranges but must explain why, and appeals courts can review the decision.
The offense level itself can shift before the court even reaches the table. If the victim was particularly vulnerable due to age or physical condition and the defendant knew or should have known, the level increases by 2.5United States Sentencing Commission. USSG 3A1.1 – Hate Crime Motivation or Vulnerable Victim At level 40, even a first-time offender lands in the 292-to-365-month range (24 to 30 years). At level 43, every criminal history category calls for life.
What Pushes the Sentence Up or Down
After a conviction, the court weighs aggravating and mitigating factors to arrive at a specific number. This is where most of the real variation happens, and it’s where defense attorneys concentrate their effort at sentencing.
Aggravating Factors
Aggravators push sentences toward the higher end of the range and sometimes above it. Common ones include a prior criminal record (especially prior violent felonies), the victim’s particular vulnerability, extreme cruelty in how the killing occurred, and multiple victims. A serious prior record is almost always the most powerful aggravator because it directly changes the applicable sentencing range.
Mitigating Factors
Mitigators can pull a sentence toward the lower end. A clean criminal record, the defendant’s age, cooperation with law enforcement, evidence of mental illness or emotional disturbance, and genuine remorse all count. No single factor guarantees a lower sentence; judges weigh them against the aggravating side. A defendant with no record and strong mitigating evidence is far more likely to receive a sentence near the bottom of the applicable range.
Firearm Enhancements
Firearm involvement can dramatically change the math. Under federal law, anyone who uses or carries a firearm during a crime of violence faces a mandatory additional prison term: at least 5 years for carrying the weapon, 7 years for brandishing it, and 10 years for firing it.6Office of the Law Revision Counsel. 18 USC 924 – Penalties These sentences run consecutively, stacking on top of the murder sentence rather than overlapping with it. If the defendant caused death by firing the weapon, the enhancement alone authorizes a sentence up to and including life in prison.
Many states have their own firearm enhancement laws that work similarly, often adding mandatory minimum terms of 10 to 25 years for using a gun during a homicide. These enhancements are the single most common reason a second-degree murder sentence balloons beyond the base range.
How Much Time You Actually Serve
The sentence a judge pronounces and the time a person actually spends in prison are often different numbers. Bureau of Justice Statistics data shows that people sentenced for murder or non-negligent manslaughter in state prisons served an average of about 15 years before initial release, with a median of roughly 13 years.7Bureau of Justice Statistics. Time Served in State Prison, 2016 That figure combines all murder degrees and manslaughter, but it illustrates how release mechanisms reduce time behind bars.
Federal Good Time Credits
The federal system abolished parole for offenses committed after November 1, 1987, requiring inmates to serve at least 85 percent of their imposed sentence.8United States Sentencing Commission. Fifteen Years of Guidelines Sentencing The only way to shorten a federal sentence now is through good conduct time. Inmates can earn up to 54 days of credit for each year of their sentence, provided the Bureau of Prisons determines they maintained exemplary compliance with institutional rules.9Office of the Law Revision Counsel. 18 USC 3624 – Release of a Prisoner
One critical limitation: good time credits are not available to inmates serving life sentences. If a federal court imposes life for second-degree murder, the person will remain in prison for the rest of their natural life unless they receive executive clemency.
State Parole
Most states still use some form of parole for murder sentences. In states that impose indeterminate sentences like “15 years to life,” the minimum term is the earliest date the inmate can appear before a parole board. The board considers prison behavior, participation in rehabilitative programming, the nature of the crime, input from the victim’s family, and the perceived risk the person poses if released. Appearing before the board doesn’t guarantee release; many inmates are denied parole multiple times before being granted it.
States also offer their own good time credits, which can advance either the release date (for determinate sentences) or the first parole hearing (for indeterminate ones). The formulas vary widely, but the principle is the same: compliant behavior earns earlier consideration for release.
Supervised Release After Prison
Federal inmates who serve a term of years for second-degree murder face up to five years of supervised release after they leave prison.10Office of the Law Revision Counsel. 18 USC 3583 – Inclusion of a Term of Supervised Release After Imprisonment Second-degree murder is classified as a Class A felony when it carries a potential life sentence.11Office of the Law Revision Counsel. 18 USC 3559 – Sentencing Classification of Offenses Supervised release carries strict conditions: regular check-ins with a probation officer, travel restrictions, drug testing, and sometimes electronic monitoring. Violating any of those conditions can send the person back to prison.
States with parole systems build supervision into the parole period itself, so a separate supervised release term is less common at the state level. Either way, a second-degree murder conviction extends government oversight of your life well beyond the prison term.
Fines and Restitution
Prison isn’t the only penalty. A federal second-degree murder conviction can include a fine of up to $250,000.12Office of the Law Revision Counsel. 18 USC 3571 – Sentence of Fine If the offense produced a financial gain or caused a measurable financial loss, the court can alternatively impose a fine of up to twice the gain or twice the loss, whichever is greater. State fines vary but are typically much lower.
Federal courts must also order restitution to the victim’s family. For an offense resulting in death, the Mandatory Victims Restitution Act requires the defendant to pay for funeral and related services, reimburse lost income, and cover costs the family incurred during the investigation and prosecution, including child care and transportation.13Office of the Law Revision Counsel. 18 USC 3663A – Mandatory Restitution to Victims of Certain Crimes These amounts aren’t capped and can reach hundreds of thousands of dollars depending on the victim’s earning capacity and family circumstances.
Attempted Second-Degree Murder
An attempt that doesn’t result in death still carries severe penalties, though they’re lower than for a completed killing. Federal law caps attempted murder at 20 years in prison.14Office of the Law Revision Counsel. 18 USC 1113 – Attempt to Commit Murder or Manslaughter Under the federal sentencing guidelines, the base offense level for attempted second-degree murder is 27, compared to 38 for a completed killing.15United States Sentencing Commission. USSG 2A2.1 – Assault with Intent to Commit Murder; Attempted Murder At offense level 27 for a first-time offender, the guideline range drops to 70 to 87 months (roughly 6 to 7 years). With a significant criminal history, the range climbs to 130 to 162 months, about 11 to 13 years.
State penalties for attempted second-degree murder vary but generally fall between 5 and 20 years. Firearm enhancements still apply, so using a gun during an attempted killing can add years of mandatory consecutive time to whatever base sentence the court imposes.
When a Charge Gets Reduced to Manslaughter
Second-degree murder charges don’t always result in a second-degree murder sentence. If the defense can show the killing happened during a sudden quarrel or in the heat of passion after adequate provocation, the charge may be reduced to voluntary manslaughter. Under federal law, voluntary manslaughter carries a maximum of 15 years, a dramatic drop from the potential life sentence for second-degree murder.16Office of the Law Revision Counsel. 18 USC 1112 – Manslaughter
Plea bargaining drives a large share of outcomes. Prosecutors frequently offer deals that reduce a second-degree murder charge to manslaughter or a lower homicide offense in exchange for a guilty plea, avoiding the cost and uncertainty of trial. As a practical matter, the plea offer is often the most important number in the case, because it sets the realistic floor for what the defendant will actually serve. A defendant facing 20 to 24 years at trial might accept a plea to voluntary manslaughter with a recommended sentence of 8 to 12 years, especially if the evidence leaves room for a heat-of-passion argument.