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Psychologist Testifies as Lindsay Clancy Murder Trial Nears Closing Arguments

The murder trial of Lindsay Clancy continued Tuesday with testimony from a prosecution psychologist following a denied mistrial request.

Published August 25, 2026 at 9:05 AM EDT

The short answer

The murder trial of Lindsay Clancy continued Tuesday with testimony from a prosecution psychologist following a denied mistrial request. The murder trial of Lindsay Clancy resumed Tuesday in Massachusetts, featuring continued testimony from Dr. Kirk Heilbrun, a forensic psychologist hired by the prosecution. The proceedings followed a brief interruption on Monday when the defense moved for a mistrial after Heilbrun began discussing Clancy's religious background.

Psychologist Testifies as Lindsay Clancy Murder Trial Nears Closing Arguments

The Facts

Who
Lindsay Clancy, Dr. Kirk Heilbrun, Judge William Sullivan, and defense attorney Kevin Reddington.
What
Testimony from a forensic psychologist in the murder trial of Lindsay Clancy.
When
Tuesday
Where
Plymouth Superior Court, Massachusetts
Why
To determine if Lindsay Clancy is criminally responsible for the deaths of her three children or if she was suffering from postpartum psychosis.

Timeline of what happened

Key dates and decisions, in the order they occurred.

  1. January 24, 2023

    Deaths of Cora, Dawson, and Callan Clancy in Duxbury home

  2. August 24, 2026

    Judge denies mistrial request after testimony regarding religion

The murder trial of Lindsay Clancy resumed Tuesday in Massachusetts, featuring continued testimony from Dr. Kirk Heilbrun, a forensic psychologist hired by the prosecution. The proceedings followed a brief interruption on Monday when the defense moved for a mistrial after Heilbrun began discussing Clancy's religious background.

Plymouth Superior Court Judge William Sullivan denied the mistrial request on Monday but reprimanded the prosecution regarding the religious testimony. Defense attorney Kevin Reddington was scheduled to cross-examine Heilbrun during Tuesday's session. Following Heilbrun's testimony, the prosecution is expected to call one final rebuttal witness before the trial moves toward its conclusion.

Clancy, 36, is charged with first-degree murder in the January 24, 2023, deaths of her three children: 5-year-old Cora, 3-year-old Dawson, and 8-month-old Callan. The children were killed in their home in Duxbury, Massachusetts. While Clancy has admitted to the killings, she has pleaded not guilty, with her defense arguing that she should not be held criminally responsible due to postpartum psychosis and overmedication.

The outcome hinges on the jury's interpretation of Clancy's mental state at the time of the January 2023 events. Prosecutors have argued the killings were planned, while the defense maintains Clancy was suffering from a severe mental health crisis known as postpartum psychosis. The legal determination of "criminal responsibility" is a specific standard in Massachusetts law that shifts the consequence from a permanent prison term to medical commitment.

The conclusion of the trial is expected to occur shortly, as closing arguments could begin as early as Wednesday. The final decision will set a specific legal precedent for how the state handles cases involving postpartum mental health and criminal intent. Once the jury reaches a verdict, the court will either proceed with sentencing for a life term or initiate the process for psychiatric hospitalization.

Summaries are written by The Plain Record to state the facts of a story plainly and without political slant. See our editorial standards, or report a correction.

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Questions readers ask

What happened: Psychologist Testifies as Lindsay Clancy Murder Trial Nears Closing Arguments?

Testimony from a forensic psychologist in the murder trial of Lindsay Clancy.

Who is involved?

Lindsay Clancy, Dr. Kirk Heilbrun, Judge William Sullivan, and defense attorney Kevin Reddington.

When did this happen?

Tuesday

Where did this happen?

Plymouth Superior Court, Massachusetts

Why does this matter?

To determine if Lindsay Clancy is criminally responsible for the deaths of her three children or if she was suffering from postpartum psychosis.