Manslaughter: Sentences After a Guilty Plea vs. After Trial, Federal Court and Courts-Martial
In federal court, the median prison term for manslaughter was 63 months after a guilty plea and 90 months after a trial, in fiscal years 2016 to 2025. In courts-martial for manslaughter under Article 119, the pattern was the opposite: the median confinement was 60 months after a guilty plea and 30 m
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In brief: In federal court, the median prison term for manslaughter was 63 months after a guilty plea and 90 months after a trial, in fiscal years 2016 to 2025. In courts-martial for manslaughter under Article 119, the pattern was the opposite: the median confinement was 60 months after a guilty plea and 30 months in contested cases that ended in conviction.
This post uses the U.S. Sentencing Commission's records of 737 people sentenced in federal court in fiscal years 2016 to 2025, compared with court-martial results from this site's Military Trial Results data (updated November 2, 2026). Acquittals and dismissals come from a second source, the Federal Judicial Center's records of 753,808 federal defendants whose cases ended in fiscal years 2016 to 2025. It is part of the Federal Prosecution Analysis series, which builds on Military Moves Toward Sentencing Guidelines to Mirror the Federal System. How the numbers were built: How the Federal Comparison Data Was Built.
Federal Sentences After a Plea or a Trial
The U.S. Sentencing Commission data covers 737 people sentenced under the guidelines for voluntary manslaughter (§2A1.3) or involuntary manslaughter (§2A1.4). The plea rate was 93%.
People who pleaded guilty had a median prison term of 63 months. The 51 people convicted at trial and sent to prison had a median of 90 months.
Court-Martial Sentences After a Plea or a Contest
From 2016 to 2025, courts-martial for Article 119 manslaughter produced 20 convictions after a guilty plea and 13 convictions in contested cases. A plea was recorded for 33 convictions, and 20 of them (61%) were guilty pleas.
The median confinement after a guilty plea was 60 months, based on 19 cases with confinement. In contested cases that ended in conviction, it was 30 months, based on 11 cases with confinement.
Federal Court and Courts-Martial Point in Different Directions
In federal court, trial sentences were higher than plea sentences. In courts-martial, plea sentences were higher than contested-case sentences.
These counts do not explain the difference, and the records give only the medians, not the reasons for any sentence. Plea agreements can set or cap a sentence, and the records here do not show the terms. The federal group also counts as a trial anyone who pleaded guilty to some counts and went to trial on others.
Medians by Service
The Army had 10 cases with confinement after a guilty plea, with a median of 71 months. Its contested group has 1 case, at 6.6 months. The Marine Corps had 4 cases in each group, at 76.5 months and 46 months.
The Air Force median was higher for 4 contested cases (113.9 months) than for 2 guilty pleas (35.5 months). The Navy had 3 and 2 cases. With counts this small, a single sentence can set the median.
| Service | Median confinement after a guilty plea (cases) | Median confinement, contested cases (cases) |
|---|---|---|
| Army | 71 months (10) | 6.6 months (1) |
| Air Force | 35.5 months (2) | 113.9 months (4) |
| Navy | 42 months (3) | 27 months (2) |
| Marine Corps | 76.5 months (4) | 46 months (4) |
Federal Sentences Against the Guideline Range
Of the 737 people sentenced, 45% received a sentence within the guideline range and 30% above it. Another 12% were below it at the government's request, and 13% were below it without one.
The federal data used here does not tie these positions to a plea or a trial, so they describe all 737 people together. A sentence below the range at the government's request is a separate category from one below the range without that request. Court-martial sentencing does not use the same range.
What the Records Cannot Show
Court-martial sentences are adjudged at trial, before clemency or appeal. Federal terms are those imposed, not time served.
The records do not show the facts, the charges, or the terms of any plea agreement. A median from 1 to 4 cases is not a reliable guide to what a typical case receives, and the Army and Air Force contested medians in particular rest on 1 and 4 cases. Neither side's figures say what any future case would receive.
How We Counted
Courts-martial: convictions for manslaughter (Article 119) with trial dates in 2016 to 2025, split by plea (20 guilty pleas, 13 contested). Medians use cases with confinement adjudged. Federal: 737 people sentenced under guideline §2A1.3 (voluntary manslaughter) or §2A1.4 (involuntary manslaughter), fiscal years 2016 to 2025 (U.S. Sentencing Commission).
Federal fiscal years run from October 1 to September 30. No person, judge, or lawyer is identified in any of these records.
What to Keep in Mind
Who is in each set of numbers. The federal sentencing numbers come from the U.S. Sentencing Commission. They count only people who were convicted and sentenced in federal district court. People whose cases were dismissed or who were acquitted are not in them. The military numbers come from court-martial results, which include acquittals. To compare acquittal or dismissal rates, the federal side uses a different source: the Federal Judicial Center's case data, which counts every defendant whose case ended.
Different cases reach each system. Federal prosecutors bring a narrow set of cases. In fiscal year 2024, immigration and drug trafficking cases were 59% of everyone sentenced in federal court (36,664 of 61,678). Many crimes that the military prosecutes, such as most assaults, most sexual assaults between adults, and drug use, are usually state crimes for civilians and reach federal court only in special situations, such as on federal land or in Indian Country. A federal case and a court-martial for the same crime can involve different kinds of facts.
Time periods. Federal numbers are by federal fiscal year (October 1 to September 30), based on the sentencing date. The military numbers are by trial date. Neither source has the date of the offense, so a change in law shows up in either data set gradually.
Offense categories do not line up exactly. Each comparison uses a federal offense group chosen to match the military article as closely as possible (see the crosswalk). Some matches are close; others are partial. The post says which federal guideline or statute was used and why it is not an exact match.
No parole in federal prison; credit for good conduct. Federal prison has no parole for crimes committed on or after November 1, 1987. A federal prisoner can earn up to 54 days of good conduct credit for each year of the sentence the judge imposed, which is about 15%. Some federal prisoners can also earn First Step Act time credits, but many offenses make a person ineligible. The numbers in this post are the sentences judges imposed, not the time people actually served.
Military confinement credit and parole. For military sentences adjudged after 2004, good conduct time is 5 days for each month of confinement, about 16%. Military prisoners can also earn up to 8 more days a month for work and programs and up to 2 days a month for special acts, with a limit of 15 days a month in total. Military prisoners can be considered for parole by their service's clemency and parole board. The military numbers in this post are the confinement adjudged at trial, not the time served.
Military sentences include punishments federal sentences do not. A court-martial sentence can include a punitive discharge (bad-conduct discharge, dishonorable discharge, or dismissal for officers), reduction in rank, and forfeiture of pay. These have no federal counterpart. A comparison of months of confinement leaves them out. A short confinement term combined with a dishonorable discharge is a heavier sentence than the months alone show.
Federal supervised release. Most federal prison sentences are followed by a term of supervised release that the judge sets as part of the sentence. A person who violates it can be sent back to prison. A court-martial cannot sentence anyone to supervision after release. Military parole and mandatory supervised release are decided later by a board, not by the judge at trial.
Who decides the sentence, and under what rules. Federal judges sentence every federal case. They must calculate the Sentencing Guidelines range, which is advisory, and must impose any mandatory minimum the statute requires unless an exception applies. In courts-martial, the accused could choose sentencing by members until the rules changed. For cases in which every guilty finding is for an offense committed after December 27, 2023, a military judge sentences alone, within sentencing parameters. Courts-martial tried in 2024 and later include both old-rule and new-rule cases, and the data cannot tell them apart.
How life sentences and "time served" are counted. In the federal numbers, a life sentence is counted as 470 months, and any other sentence longer than 470 months is counted as just under 470 months. A sentence of "time served" is counted as one day (0.03 months). Averages are affected by these rules; medians much less.
Plea agreements work differently. In federal court, most plea agreements do not bind the judge on the sentence. Since 2019, a military plea agreement can set a minimum and maximum sentence that the military judge must follow if the judge accepts the agreement. The federal numbers count anyone who pleaded guilty, with or without a written agreement.
How "plea" and "trial" are counted. In the federal sentencing numbers, "trial" means the person was convicted after a trial, including people who pleaded guilty to some counts and went to trial on others. People acquitted at trial are not in these numbers at all (see "Who is in each set of numbers"). In the federal case data, the trial rate counts both convictions and acquittals at trial among all defendants whose cases ended, including dismissed cases. Military numbers count contested cases that reached a verdict. These denominators are not the same, and each post states the one it uses.
Related Analysis
- Military Moves Toward Sentencing Guidelines to Mirror the Federal System (the background article)
- Federal Prosecution Analysis (all federal posts)
- How the Federal Comparison Data Was Built (sources and method)
- Murder and Manslaughter: Federal vs. Court-Martial Sentences, 2016–2025 (overview)
- Manslaughter Charges: How Often Federal Trials and Courts-Martial End in Acquittal
- Guilty Pleas in Manslaughter Cases: Federal Court vs. Courts-Martial
- Manslaughter Convictions of Junior Enlisted (E-1 to E-4): Courts-Martial Compared With Federal Court
- Manslaughter Convictions of NCOs (E-5 to E-9): Courts-Martial Compared With Federal Court
- Manslaughter Sentences: Federal Court vs. Courts-Martial, 2016–2025
- Manslaughter: Federal Sentences vs. Army Courts-Martial
- Guilty Pleas in Army Manslaughter Cases: How Often, and What Came Next (court-martial data)
- Navy-Marine Corps Article 119 Cases by the Numbers, 2017–2025 (court-martial data)
- What Sentence Follows a Navy-Marine Corps Manslaughter Conviction? (court-martial data)
- Article 119 (Manslaughter): Court-Martial Data and Trends (court-martial data)
- Article 119 UCMJ: Voluntary and Involuntary Manslaughter (law firm reference page)
- U.S. Sentencing Commission, Individual Offender Datafiles (source)
- Federal Judicial Center, Integrated Database (criminal defendants) (source)
About the author. Jocelyn C. Stewart is a retired Army JAG with more than 24 years of trying courts-martial and more than 200 jury trials. She hosts Where All The Bodies Are Buried and runs the Law Office of Jocelyn C. Stewart. This analysis is for education and information only. It is not legal advice, and every case is different.