←  Commonwealth v. Clancy

Plymouth County Superior Court, Massachusetts · No. 2383CR00199

Commonwealth v. Clancy

TLDR Case Flow

Where it standsNo verdict. The jury could not agree, and a mistrial was declared on September 4, 2026. Whether she can be tried again was argued on November 2, and the judge hasn’t ruled.

  1. The Commonwealth must prove · First

    Whose burden is it? The Commonwealth’s

    Did the Commonwealth prove the elements of murder?

    Not in dispute

    A burden is the job of proving something, so before anything else it matters whose job that is. Here it’s entirely the Commonwealth’s, which is what Massachusetts calls the prosecution. They have to prove two things, which are this question and the one under it, and they have to prove both beyond a reasonable doubt, the highest standard the law has.

    She doesn’t have to prove anything, and that includes proving she was insane. The judge told the jury so in these words: “The defendant has no burden to prove a lack of criminal responsibility.” This is the part most arguments about the case get backwards. People assume it was on her to prove she was insane. It was on them to prove she was criminally responsible.

    Elements are the separate pieces a crime is made of, and the prosecution has to prove every one of them. In most murder trials this is the whole fight. In this one it wasn’t a fight at all. The defense didn’t dispute what she did. They even offered to stipulate to it, which means formally agreeing something is true so that nobody has to prove it.

    The Commonwealth turned that offer down and put the evidence in front of the jury anyway. So this step is marked as not in dispute, and the real argument is all in the second thing they had to prove.

    If yes

  2. The Commonwealth must prove · Second

    The jury stopped here

    Did the Commonwealth prove she was criminally responsible?

    No verdict

    Criminal responsibility is the legal name for what most people would call the insanity question. It asks if she can be held answerable for what she did, given the state of her mind that day. This is the only thing the two sides really fought over. The trial ran for about six weeks and nearly all of the evidence went to this.

    The Commonwealth said she was severely depressed but not psychotic, and that she made a series of deliberate choices. The defense said she was in postpartum psychosis. To prove she was responsible, the Commonwealth had two ways of doing it, which are the two cards inside this one. This is also as far as the jury got. They couldn’t agree on it, and that’s why it says no verdict.

    Whichever way they try, it has to be proved beyond a reasonable doubt. That doesn’t mean beyond every possible doubt, but it’s a long way past “probably.” And all twelve jurors have to agree on the answer, whichever answer it is.

    A yes on either one is enough

    The first way

    Was she free of any mental disease or defect?

    This is the first way the Commonwealth could prove she was criminally responsible. They could show that at the time of the killings she had no mental disease or defect at all. That phrase is a legal one, not a medical one. It doesn’t have to match any official diagnosis, and it’s the jury that decides if she had one, not the doctors.

    If the Commonwealth proved this, that was enough, and the other question in this card wouldn’t matter.

    or

    The second way

    If she had one, did she keep substantial capacity?

    This is the second way, in case the jury thought she did have a mental disease or defect. Having one doesn’t make a person not responsible all by itself. The Commonwealth could still succeed by proving she kept what the law calls substantial capacity, and that has two parts. One is that she could appreciate that what she was doing was wrong. The other is that she was able to make herself follow the law.

    They had to prove she kept both. If her illness took away either one, she isn’t responsible. And “appreciate” is a stronger word than “know.” It means really understanding that something is wrong, not just being aware that it’s illegal.

    If proved

    Yes

    Criminally responsible

    Then the jury reaches the counts

    Four ways it can land

    If the jury had found she was criminally responsible, they still wouldn’t have been done. That finding only opens the door to the actual charges, which were three counts of first-degree murder. On those the jury would have had four options, which were first-degree murder, second-degree murder, manslaughter, or not guilty.

    This is the only point where the evidence about what she did, and how, would really start to matter, because that’s what separates one of those options from the next.

    If not proved

    No

    Not criminally responsible

    Then the verdict is

    Not guilty by reason of insanity

    If the Commonwealth didn’t prove she was criminally responsible, the verdict is not guilty by reason of insanity. A lot of people hear that as walking free, and it isn’t. What generally happens next is that the district attorney asks the court to commit her, which means ordering her held in a mental health facility or at Bridgewater State Hospital.

    A commitment gets reviewed every so often, but it can be renewed again and again with no limit, for as long as she is still ill and still dangerous. The judge told the jury it could last for the rest of her life.

    If the jury cannot agree

  3. What actually happened

    Neither. The jury never answered the question

    Then

    A mistrial, declared on September 4, 2026

    This is what actually happened, and it’s neither of the two endings that question leads to. The jury deliberated for thirty-eight hours over seven days and sent the judge three notes. They ended up split eleven to one. A verdict has to be unanimous, so eleven to one counts for exactly as much as no agreement at all. That’s called a hung jury.

    On September 4, 2026, the judge declared a mistrial, which is a trial that ends without a verdict. A mistrial decides nothing. She wasn’t found guilty and she wasn’t found not guilty. The charges are still there and the case can be tried again in front of a new jury. The defense has asked the court to rule that a second trial isn’t allowed. That was argued on November 2, 2026. The judge hasn’t ruled yet, and the next hearing is November 16.

The burden runs the opposite way to the intuition: the Commonwealth had to prove she was responsible, not the defense that she was not. Nothing on this diagram asks whether she killed her children, because by the time the jury was empaneled nobody was arguing about it.

Back to the case

Notes

How this was made, and what it leaves out

Source

Built from the 299 pages of search warrant affidavits unsealed in October 2023, the emergency petition to the Supreme Judicial Court of September 4, 2026, the Massachusetts model jury instruction on criminal responsibility, and transcripts of the televised trial.

A caution about those transcripts. They are transcripts of the broadcast, not of the court reporter, so they carry no page and line numbers — citations here are to the trial day, which is why they look unlike the citations on the other pages in this series. They also misspell names, including the judge’s. Every name on this page has been checked against something other than the transcript.

Dates and rulings outside those documents come from the district attorney’s press releases and from news reporting. Every citation with a public copy links to it, and anything taken from coverage is marked as reporting. The court’s own orders in this case are not published online, so a ruling is cited to the coverage of it.

What is sealed

Sealed throughout: the defendant’s medical and psychiatric records beyond what was put in evidence, and material concerning the surviving family. Parts of the expert litigation were heard in camera. Since September 14, 2026, the juror list has been impounded indefinitely, after the identity of the holdout juror was circulated online.

Names

Three children died, ages five, three and eight months. They are named in the public record; they are named here once, in the entry for the day it happened, and are not used as illustration anywhere else on the page. The clinical and forensic detail in the medical testimony is cited and summarized, not reproduced. That is a deliberate limit and it costs the page something: readers who want that detail will have to go to the record for it.

What this is not

Not legal advice, not a finding, and not a verdict — here least of all. A mistrial decides nothing. It leaves the charges live, the defendant presumed innocent of them, and every contested question exactly where it stood before the trial began. This page does not supply the answer the jury declined to give. The volume of opinion outside the courtroom did not supply it either, and neither does the reporting of an eleven-to-one split: under the law an eleven-to-one split is not a verdict, and a juror who will not join eleven others has done nothing wrong by refusing.

Tell me what I got wrong

If something here is missed, misrepresented or unfairly portrayed, let me know. Point me at a filing or record and I will verify it on my end. I actively look to correct, improve and remain unbiased.

Type of issue

No account, no name, no email. The submission stores what you typed, your address and your browser string, to make abuse traceable and for nothing else.

This case is live and this page will go out of date. Record reviewed through November 8, 2026, six days after the double jeopardy motion was argued. The next hearing is November 16, 2026.

Terms

Plain English

Words this page uses because the court uses them. Nothing here is special to this case.

The paperwork

Docket
The court’s numbered list of everything filed in a case. Entry 42 is the forty-second thing filed.
Indictment
The formal charge that starts a felony case in the Superior Court. It replaces the complaint the district court began with.
Count
One charged offense. This case went to the jury on three of them, and a jury answers for each one separately.
Grand jury
A jury that decides only whether there is enough evidence to charge someone, not whether they are guilty. It hears one side.
Transcript
The word-for-word record of a proceeding. A court reporter’s transcript is cited by page and line; a transcript of a televised proceeding, as here, has no line numbers and is cited by day.
Exhibit
A document, object or record put in evidence. This trial had roughly three hundred.
Under seal
Filed with the court but kept off the public record. Both sides and the judge can read it; nobody else can. Material is unsealed when that is lifted, as the search warrants were in October 2023.
Impounded
Withheld from public inspection by order. The juror list in this case was impounded indefinitely after the trial.
Affidavit
A sworn written statement. A search warrant affidavit is the officer’s account of why there is reason to search. It is not evidence at trial.

How a case moves

Arraignment
The hearing where the charges are read and the defendant pleads. It happens once in the district court and again after indictment.
Motion
A formal request that the court do something. The other side files an opposition; the moving side may then file a reply.
Stipulate
To agree formally that something is true so it need not be proved. The other side does not have to accept the offer, and here it did not.
In camera
Heard in private, in the judge’s chambers rather than in open court.
Rebuttal
Evidence one side puts in to answer the other’s case, after that case has closed. It cannot open new ground.
Interlocutory appeal
An appeal taken in the middle of a case rather than at the end of it. They are rare, and usually urgent.
Under advisement
Argued, but not yet decided. The judge will rule later.

The ones that can end it

Mistrial
A trial ended without a verdict. It decides nothing: the charges stay live and the case can, in principle, be tried again.
Hung jury
A jury that cannot reach the required unanimity. Eleven to one is not a verdict, and is worth no more than nothing to one.
Tuey-Rodriguez charge
What a Massachusetts judge tells a deadlocked jury: reconsider, but surrender no conscientiously held belief. Elsewhere it is called an Allen charge, or a dynamite charge.
Rule 25
A motion asking the judge to enter a finding of not guilty because no rational juror could convict on the evidence. It is about legal sufficiency, not about whether this jury was persuaded.
Double jeopardy
The rule against being tried twice for the same offense. A mistrial usually does not trigger it, which is why it has to be argued.
Manifest necessity
The standard a judge must meet to end a trial without a verdict over the defendant’s objection. If it was not met, a second trial is barred.

The test this case turned on

Burden
Which side has to prove a thing. If they do not, they lose that point, even if the other side proves nothing either.
Beyond a reasonable doubt
The criminal standard, and the highest one the law uses. It is not proof beyond all possible doubt.
Element
One of the separate things the prosecution has to prove for a particular crime. If one is missing, the charge fails.
Criminal responsibility
Whether the defendant can be held answerable at all. In Massachusetts the Commonwealth must prove she was responsible, beyond a reasonable doubt. The defendant proves nothing.
Mental disease or defect
A legal term, not a medical one. It need not match any formal diagnosis, and a jury decides whether there was one.
Substantial capacity
The second prong. Even with a mental disease or defect, a person is responsible if she could both appreciate that what she was doing was wrong and conform her conduct to the law. Losing either is enough.
Appreciate
To understand, rather than merely to know. Knowing an act is illegal is not the same as grasping what that means.
Not guilty by reason of lack of criminal responsibility
Often shortened to NGI. It is not an acquittal in effect: it ordinarily leads to a petition to commit, and commitment is reviewed at intervals and renewable without limit.
Commitment
A court order holding a person in a hospital for treatment, not as a punishment. It is reviewed at intervals and can be renewed.
Postpartum psychosis
A rare and serious illness arising after childbirth. It is a clinical term and carries no legal consequence by itself — the legal test is the one above.