The Lindsay Clancy Case: Postpartum Psychosis and the "Insanity Defense," Explained

Source: Lanier Law Group

URL: https://www.lanierlawgroup.com/lindsay-clancy-postpartum-psychosis/

Date: August 25, 2026

By Lisa Lanier, Attorney, Lanier Law Group, P.A.

If you are worried about a new or expecting parent right now: call or text the 988 Suicide and Crisis Lifeline, or the National Maternal Mental Health Hotline at 1-833-TLC-MAMA (1-833-852-6262), free and confidential, 24 hours a day. Postpartum psychosis is a medical emergency. It is always appropriate to seek urgent care rather than wait to see whether things improve.

What Has Been Reported So Far

Lindsay Clancy is on trial in Plymouth Superior Court in Massachusetts for the deaths of her three young children in January 2023. The public record breaks down into three parts: what happened that day, how the case moved through the courts, and where the trial stands now.

The Events of January 2023

On January 24, 2023, according to court records and widely published reporting, prosecutors say Lindsay Clancy strangled her three children at the family home in Duxbury, an affluent coastal town about forty miles south of Boston, and then attempted to take her own life by going out a second-story window, leaving her paralyzed from the waist down. The children were Cora, age five, Dawson, age three, and Callan, eight months old. Cora and Dawson were pronounced dead that evening, and Callan died days later. The medical examiner attributed the deaths to strangulation.

Clancy had worked as a labor and delivery nurse at Massachusetts General Hospital. That detail has hung over the case from the beginning. A woman whose profession was helping mothers through childbirth became, according to her own defense, a person overtaken by one of the most severe complications that childbirth can bring.

How the Case Moved Through the Courts

Clancy was first arraigned in February 2023, appearing by video from a hospital bed, and pleaded not guilty. Later that year she was indicted and ordered held without bail at Tewksbury State Hospital, a secure state facility, where she has remained while awaiting and now standing trial. In December 2024, her defense filed a formal notice that she would raise a defense of lack of criminal responsibility, the legal mechanism at the center of the case. Shortly before trial, prosecutors dropped a set of strangulation charges as redundant to the murder counts, leaving three counts of first-degree murder.

Where the Trial Stands Now

Jury selection began in July 2026, followed by opening statements and weeks of testimony. Prosecutors called dozens of witnesses before resting. The defense rested after presenting expert testimony that Clancy was suffering from postpartum psychosis and was not criminally responsible, and prosecutors then called rebuttal witnesses who disputed those conclusions. During the rebuttal, the defense twice asked the judge to declare a mistrial after a prosecution witness referenced Clancy's Catholic faith. The judge denied both requests, called the testimony problematic, and instructed jurors to disregard it.

With testimony concluded, closing arguments are underway as of August 25, 2026. The case is expected to reach the jury shortly after, followed by deliberations.

What Prosecutors Allege and What the Defense Argues

The dispute in the Clancy case is not about who caused the deaths, which both sides accept, but about her state of mind at the time.

Prosecutors argue that Clancy acted deliberately. They point to evidence that she asked her husband to leave the house to pick up takeout and children's medication, which they say created a window of time to carry out the killings, and they describe her actions as methodical rather than the product of a mind that could not tell right from wrong. Their expert witnesses testified that she retained the capacity to be held responsible, and one prosecution forensic psychologist testified that parts of her account of hearing voices appeared exaggerated or fabricated.

Clancy's defense team argues that she was suffering from severe, undiagnosed postpartum psychosis and was heavily medicated at the time, and that she was therefore not criminally responsible. Witnesses for the defense testified that Clancy described hearing a commanding voice in the period surrounding the deaths. Her lawyers characterize what happened not as a plan but as the tragic result of a mental illness that spiraled without adequate treatment.

Understanding "Lack of Criminal Responsibility" in Massachusetts

In Massachusetts, the defense commonly called an "insanity defense" is formally known as lack of criminal responsibility. It asks whether a mental illness left a person unable to appreciate that their conduct was wrong or unable to control it.

Why Massachusetts Does Not Say "Insanity"

Massachusetts does not typically use the term "insanity." The recognized defense is called lack of criminal responsibility, drawn from the standard set in the state's Commonwealth v. McHoul decision. Under that standard, a person is not criminally responsible if, because of a mental disease or defect, they lacked substantial capacity either to appreciate the wrongfulness of their conduct or to conform their conduct to the requirements of the law.

Who Has to Prove What

In Massachusetts, the prosecution carries the burden. Once the defense properly raises the issue of criminal responsibility, prosecutors must prove beyond a reasonable doubt that the defendant was criminally responsible, which is the reverse of the rule in most states, where the defendant must prove the defense.

What a "Not Criminally Responsible" Verdict Actually Means

A "not criminally responsible" verdict does not mean a person goes free. If a jury reaches that finding, the outcome is typically not release but a court process that can lead to commitment in a secure state psychiatric facility, potentially for a long time.

What Is Postpartum Psychosis?

Postpartum psychosis is a rare, severe psychiatric emergency that can develop in the days and weeks after childbirth. It affects roughly one to two of every 1,000 new mothers and can involve hallucinations, delusions, and a loss of touch with reality.

How It Differs From Postpartum Depression

Postpartum psychosis is not a more intense version of postpartum depression; it is a distinct and far more dangerous condition. Postpartum depression is relatively common and affects an estimated ten to twenty percent of mothers. Postpartum psychosis is rare, striking roughly one to two in every thousand births, and is treated as a psychiatric emergency that often requires immediate, inpatient care.

Symptoms and Onset

Postpartum psychosis tends to come on rapidly, often within days to a few weeks after childbirth, and its presentation can fluctuate dramatically. Reported symptoms include hallucinations, delusions that sometimes center on the baby, cognitive disorganization and confusion, severe swings in mood, intense anxiety, and serious sleep disturbance.

Why It Is Dangerous, and Why It Is Treatable

Untreated postpartum psychosis carries an estimated four percent risk of infanticide and a five percent risk of suicide, according to figures widely cited in the medical and public health literature, which is why clinicians treat it as an emergency. The condition is often treatable when it is identified and addressed early, frequently through inpatient care and medication.

When a Missed Postpartum Psychosis Diagnosis Becomes Malpractice

When providers fail to screen for, recognize, or treat postpartum psychosis and a patient is harmed as a result, that failure can rise to the level of medical malpractice.

The Civil Lawsuits Running Alongside the Criminal Trial

Separate from the murder trial, two civil lawsuits have been filed over the medical care Lindsay Clancy received in the months before her children died. One was filed by Clancy herself and one by her former husband, and both are pending in Massachusetts state court against several of the providers and health systems involved in her treatment.

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