A Massachusetts mother accused of strangling her 3 children is seeking an insanity defense

A Massachusetts nurse who allegedly strangled her three young children to death last year before trying to kill herself is seeking an insanity defense, according to court documents.

Lindsay Clancy was charged with three counts of first-degree murder and strangulation in September 2023, after prosecutors say she used exercise belts to strangle her daughter Cora, 5, her three-year-old son Dawson and her 8-month-old baby. Callan, before attempting to kill himself at his Duxbury home.

Clancy's attorney, Kevin J. Reddington, filed the notice in Plymouth Superior Court Dec. 13, which stated that “the defendant's statements about his state of mind will be relied upon by the defendant's expert witnesses, and the defendant intends to present before the court. in court to defend the lack of criminal responsibility.”

Court documents reveal the events that led to the decision of the woman, 32, for allegedly killing her children.

MASSACHUSETTS MOTHER LINDSAY CLANCY'S 911 DISPATCH SHOWS FIRST RESPONDERS IN PAIN

Plymouth District Court unsealed 299 pages of records revealing 11 search warrants issued in January 2023 and kept secret.

The warrants were used to collect exercise belts, medicine, computers, books, phones, belts, bathrobes, pajamas and a silver knife.

The documents say the mother of three told her husband of six years, Patrick Clancy, that she felt “anxious” about returning to work at Massachusetts General Hospital, where she was an obstetrician.

PAGE TIME LINDSAY CLANCY

Lindsay Clancy with two of their three children in this undated photo (Lindsay Marie Clancy/Facebook)

Patrick told police Lindsay went to psychiatrists, who prescribed several medications, including Zoloft, Valium, Trazodone, Ativan, Klonopin, Prozac and Seroquel.

According to records previously obtained by Fox News Digital, Patrick confided in a family friend about his wife's mental health issues and expressed concern that she was having trouble stopping a prescription for anxiety last month.

The documents also detailed Clancy's actions before he killed his three children.

On the morning of Jan. 24, Clancy took her daughter to the pediatrician, called a local CVS store about a stool softener prescription and ordered dinner from a ThreeV restaurant in Plymouth.

LINDSAY CLANCY'S HUSBAND 'BEGGED KIDS TO BREATHE' AFTER MOTHER 'HEARD VOICES' OF KILL HERSELF.

Duxbury police are investigating the deaths of three children Jan. 25, 2023, in Duxbury, Mass. (David L Ryan/The Boston Globe via AP)

He also used Apple Maps on his cellphone “to find the time it would take someone to get from his home in Duxbury to ThreeV in Plymouth,” according to court documents.

Clancy is said to have also texted her husband to see if he could pick up groceries from the restaurant and medicine at CVS.

When Patrick arrived home, it was “quiet,” court documents said.

Finally, he found blood on the floor and saw an open window.

According to court documents, he ran outside to the yard and found Lindsay on the ground, unconscious and with cuts on her wrists and neck and immediately called 911.

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Boston 25 News reported that Assistant District Attorney Jennifer L. Sprague also filed a motion in Plymouth Superior Court last week, seeking a September trial date.

“Although the results of DNA tests and expert reports are preliminary, it is believed that these findings will be conclusive.[d] before September of 2025,” he wrote in a file obtained by the channel.

Fox News Digital's Sarah Rumpf-Whitten and Chris Eberhart contributed to this report.