Homicide & Murder Defense

What Massachusetts law calls murder

Massachusetts divides murder into two degrees. Under G.L. c. 265, § 1, a killing is murder in the first degree if it was committed with deliberately premeditated malice aforethought, or with extreme atrocity or cruelty, or in the commission or attempted commission of a crime punishable by death or life imprisonment. All other murder is murder in the second degree. The statute also provides that the degree is found by the jury, not fixed by the prosecutor's charging decision.

Underneath both degrees sits malice, and malice in Massachusetts is broader than most people expect. The Commonwealth may prove it three ways: that the defendant intended to kill, that the defendant intended to cause grievous bodily harm, or that the defendant intended to do an act which, in the circumstances known to him, a reasonable person would have known created a plain and strong likelihood that death would follow. That third prong is why a case with no evidence of any intent to kill can still be prosecuted as murder.

Felony-murder after Commonwealth v. Brown

This is the part of Massachusetts homicide law that published summaries most often get wrong, including summaries written after the law changed.

For most of the Commonwealth's history, the felony-murder rule supplied malice automatically. If a death occurred during a qualifying felony, the intent to commit that felony substituted for any intent respecting the killing. That is no longer how it works. In Commonwealth v. Brown, 477 Mass. 805 (2017), decided September 20, 2017, Chief Justice Gants wrote separately, joined by three other justices — a majority of the seven-member court. That concurrence abolished what it called the fiction of constructive malice.

Two consequences follow, and they are structural rather than technical:

• Actual malice must now be proved. The Commonwealth must establish one of the three malice prongs independently. The predicate felony no longer supplies the mental state on its own.
• Felony-murder is no longer an independent theory of liability. It survives only in its statutory role under § 1 — as an aggravating element that raises a murder already proved with actual malice to the first degree.

The change is prospective. It governs trials commencing after the date of the Brown opinion, which as a practical matter means every pending and future case. Note carefully that the trigger is the date of trial, not the date of the offense — a distinction that is regularly misstated and that matters a great deal to anyone whose case was tried before September 2017.

What a murder conviction carries

Sentencing under G.L. c. 265, § 2 is where the two degrees separate completely.

First-degree murder carries life in state prison without parole eligibility. G.L. c. 127, § 133A expressly excludes from parole consideration those serving life for first-degree murder who had attained the age of eighteen at the time of the offense.

Second-degree murder also carries a life sentence, but with parole eligibility after a minimum term the sentencing judge fixes. Under G.L. c. 279, § 24, that minimum is not less than fifteen and not more than twenty-five years.

There is one further wrinkle that anyone reading the statute alone will miss entirely. In Commonwealth v. Mattis, 493 Mass. 216 (2024), the Supreme Judicial Court held that mandatory life without parole for emerging adults — those aged eighteen, nineteen or twenty at the time of the offense — violates article 26 of the Massachusetts Declaration of Rights, which the Court reads as more protective than the Eighth Amendment. Massachusetts was the first state to so hold. The statutory text of § 2 and § 133A still says, on its face, that anyone eighteen or older serves life without parole. The Legislature has not conformed those sections to Mattis. Reading the statute by itself now produces the wrong answer for an entire class of defendants.

Manslaughter, and why it is often the real question

Manslaughter is an unlawful killing without malice. Its elements come from case law and the Model Jury Instructions rather than from the statute; G.L. c. 265, § 13 supplies the penalty, which is up to twenty years in state prison, or up to two and a half years in a house of correction with a fine.

Voluntary manslaughter covers three situations. A killing in the heat of passion on reasonable provocation — provocation that would overwhelm a reasonable person's capacity for reflection or restraint, that did in fact overwhelm this defendant's, and where there was no reasonable cooling period before the killing. A killing on sudden combat, where a sudden mutual assault occurred and where even a single blow may amount to reasonable provocation. And a killing where the defendant genuinely acted in self-defense but used more force than was reasonably necessary — where self-defense fails solely because of the degree of force.

One limit is worth stating plainly, because it disappoints people: mere words, no matter how insulting or abusive, do not ordinarily by themselves constitute reasonable provocation.

Involuntary manslaughter takes two forms. The first is a killing caused by wanton or reckless conduct — conduct involving a high degree of likelihood that substantial harm will result to another. That standard traces to Commonwealth v. Welansky, 316 Mass. 383 (1944), the Cocoanut Grove fire case, and it is partly objective: the defendant need not have subjectively appreciated the danger if a reasonable person in the same circumstances would have recognized it, while actual awareness of the risk suffices regardless. That is precisely what separates wanton or reckless conduct from ordinary, or even gross, negligence — and it is why the line between manslaughter and no crime at all is so often the contested ground. The second form is battery manslaughter: an unintentional killing caused by a battery the defendant knew or should have known endangered human life.

In a great many homicide prosecutions the genuine dispute is not whether the defendant caused the death. It is whether what the Commonwealth can actually prove about his state of mind supports murder or supports manslaughter.

Deaths involving a motor vehicle

Massachusetts treats a death caused by a motor vehicle under two separate schemes, and the gap between them is severe.

G.L. c. 90, § 24G defines motor vehicle homicide. Subsection (a), the felony, requires operating under the influence and operating recklessly or negligently so as to endanger, causing death. It carries two and a half to fifteen years in state prison, or one to two and a half years in a house of correction, with a mandatory minimum of one year that cannot be suspended or reduced. Subsection (b), the misdemeanor, reaches operating under the influence or negligent operation endangering the public, causing death, and carries thirty days to two and a half years. The conjunction is the whole case: (a) requires both, (b) requires either.

Separately, G.L. c. 265, § 13½ punishes manslaughter committed while operating under the influence. That offense carries five to twenty years in state prison and a fine of up to $25,000, with a five-year mandatory minimum that cannot be suspended and no eligibility for probation, parole, furlough or good-conduct deductions until five years are served. License loss runs for an extended period up to life, and in no event less than fifteen years.

Where a murder case is heard, and how it gets there

A murder case is tried in the Superior Court. That follows from two statutes read together: G.L. c. 212, § 6 gives the Superior Court original jurisdiction of all crimes, while G.L. c. 218, § 26 caps District Court felony jurisdiction at offenses punishable by no more than five years in state prison. Murder, punishable by life, falls outside that cap. A District Court can still arraign a person charged with murder and handle probable-cause proceedings; it simply cannot try the case.

Getting to the Superior Court requires an indictment, which means a grand jury. Under Mass. R. Crim. P. 5, a grand jury consists of not more than twenty-three jurors, thirteen constitute a quorum to hear evidence, and an indictment may be returned only on the concurrence of twelve or more.

The grand jury hears the Commonwealth's evidence. The defense has no right to present a case there, no right to cross-examine, and ordinarily no presence in the room. People are often shocked by this, and it is worth understanding early rather than discovering it after an indictment has already issued.

Bail and pretrial detention

In Vasquez v. Commonwealth, 481 Mass. 747 (2019), the Supreme Judicial Court held that a defendant charged with murder in the first degree has no right to bail, but may be admitted to bail in the discretion of the judge. The Court explained that such a defendant is presumed not entitled to bail, given the flight risk inherent in exposure to a life sentence.

The distinction matters and is regularly flattened. It is not accurate to say that murder is non-bailable in Massachusetts. Bail is available; there is simply no right to it, and a presumption running the other way. That leaves room for argument, and the argument is worth making with real preparation behind it.

Separately, G.L. c. 276, § 58A allows the Commonwealth to move for pretrial detention on dangerousness grounds. Detention under § 58A requires a finding by clear and convincing evidence that no conditions of release will reasonably assure the safety of any other person or the community, and detention is capped at 120 days in the District Court and 180 days in the Superior Court, absent good cause.

Which track the Commonwealth chooses — flight risk under Vasquez, or a § 58A dangerousness hearing — shapes what the defense has to meet, and the two are not interchangeable.

The automatic appeal that exists only for first-degree murder

Massachusetts gives a person convicted of first-degree murder a form of appellate review that exists nowhere else in the system. Under G.L. c. 278, § 33E, entry in the Supreme Judicial Court transfers the whole case to that court for its consideration of the law and the evidence.

Four features make it genuinely distinctive:

• It is automatic and direct. The appeal goes straight to the SJC, bypassing the Appeals Court. No leave is required.
• The whole case transfers. The Court is not confined to preserved claims or to the issues the parties choose to raise.
• The remedial powers are extraordinary. The SJC may order a new trial, direct entry of a verdict of a lesser degree of guilt, or remand for sentencing, where the verdict was against the law or the weight of the evidence, or for any other reason that justice may require. The power to reduce the degree of a verdict on the Court's own view of justice has no counterpart in ordinary appellate review. Brown is itself an example: the Court affirmed the conviction but reduced the verdict from first degree to second degree.
• It happens once. After rescript, a further appeal requires a single justice to allow it on the ground that it presents a new and substantial question. Plenary review is a one-time benefit, which is a strong reason to build the trial record with the § 33E appeal already in mind.

A term-of-art note, because it confuses almost everyone: § 33E uses the phrase “capital case.” Massachusetts has no death penalty. In this statute the phrase means a first-degree murder conviction, or a third-offense habitual offender conviction.

If you are being investigated and not yet charged

The period before charges issue is usually the period in which the most damage is done, and it is the period in which people are least likely to call a lawyer.

Several things are true at once. Investigators may speak with you without telling you that you are a suspect. What you say is evidence whether or not you were arrested, warned, or in custody. A grand jury can be convened without your knowledge. And decisions being made during that window — what theory the case will be charged on, what degree, whether a manslaughter resolution is on the table at all — are being made before anyone hears from the defense unless someone speaks for you.

Common questions

Sources

Every legal statement on this page traces to one of the following. Massachusetts law changes; where a point is contested or recently decided, that is noted in the text above.

• G.L. c. 265, § 1 — Murder defined
• G.L. c. 265, § 2 — Punishment for murder
• G.L. c. 265, § 13 — Manslaughter
• G.L. c. 265, § 13½ — Manslaughter while operating a motor vehicle
• G.L. c. 90, § 24G — Motor vehicle homicide
• G.L. c. 127, § 133A — Parole eligibility, life sentences
• G.L. c. 279, § 24 — Minimum term on a life sentence
• G.L. c. 276, § 58A — Pretrial detention on dangerousness
• G.L. c. 278, § 33E — Plenary review in capital cases
• G.L. c. 212, § 6 — Superior Court jurisdiction
• G.L. c. 218, § 26 — District Court criminal jurisdiction
• Mass. R. Crim. P. 5 — The grand jury
• Model Jury Instructions on Homicide (rev. March 30, 2026)

Written by Michael G. Cashman, Esq., 31 years in Massachusetts criminal courtrooms as both a defense attorney and a prosecutor. Full background and credentials. Last reviewed 2026-09-18.

This page is general information about Massachusetts law. It is not legal advice, it does not create an attorney-client relationship, and no outcome is promised or implied. Every case turns on its own facts.