Prosecutors then began calling rebuttal witnesses in the trial, which is likely entering its final days. Closing arguments are expected next week.
Clancy, 36, has pleaded not guilty to murder charges in the deaths of her children Callan, Dawson and Cora Clancy, who ranged from 8 months to 5 years old. They were found in the basement of the family's home in coastal Duxbury, Massachusetts. Clancy jumped from a second-story window after strangling the children and remains paralyzed from the waist down.
Prosecutors argue that Clancy, a former labor and delivery nurse, planned the killings.
Clancy's lawyer, Kevin Reddington, hasn't disputed that she killed the children but says she should not be held criminally responsible because she had postpartum psychosis, a rare mental illness linked to the stress, sleep deprivation and hormonal changes that follow childbirth.
He sought to bolster that defense by having the jury hear from more of Clancy's family members, who detailed her worsening mental health and attempts to fix it through psychiatric treatment and medications before the January 2023 killings. The jury also heard from a psychologist and a hospital chaplain who met with Clancy after the killings.
The defense's final witness also testified at the trial of Texas mom Andrea Yates
For his final witness on Friday, Reddington called Dr. Phillip Resnick, a forensic psychiatrist and expert in filicide, or the killing of a child by a parent.
Resnick testified that Clancy was "clearly psychotic" on the day she killed her children and was not in control of her actions.
"It was almost like she was a puppet and someone else was pulling the strings," said Resnick, who testified for the defense in the 2006 trial of Andrea Yates, the Texas mother who drowned her five children in 2001.
Resnick said he spent hours interviewing Clancy four months after the killings and believed she tended to minimize rather than exaggerate her symptoms. He said she suffered from severe depression, showed evidence consistent with bipolar disorder and reported hearing a voice commanding her to kill her children.
Resnick described several categories of filicide, including killings involving abuse. Others involve psychosis or what he calls "altruistic" filicide - a killing committed "out of love rather than hostility." He said he found Clancy's case involved both of the latter categories, but he didn't find evidence of abuse.
Resnick said Clancy had a delusional belief that if social services took the children or if she killed herself, her children would suffer without her, and believed that they would be better off dying with her and going to heaven.
"She believed that she was doing what was right for her children," he said.
Under cross-examination by prosecutor Jennifer Sprague, Resnick acknowledged that Clancy did not disclose thoughts of harming her children to medical providers who asked, but said that was "very common because people fear their children will be taken away."
"So it's better to kill them than have them taken away?" Sprague asked.
The judge struck the question.
Prosecutors say Clancy wasn't suffering from psychosis or bipolar disorder
Prosecutors argue that Clancy contrived to get her husband out of the house the day of the killings. They have attempted to show that while she was getting treatment for anxiety, insomnia and depression, she wasn't suffering from psychosis or bipolar disorder.
After the defense rested, prosecutors called forensic psychiatrist Dr. Avram Mack as a rebuttal witness. Mack agreed that Clancy suffered from a major depressive episode but said he found no evidence of mania or hypomania to support a bipolar diagnosis - or of psychosis - leading up to the killings.
Mack said Clancy recounted the killings to him, saying she heard a loud male voice telling her to kill the children so she could kill herself. She recalled strangling the children and saying "go to God" as she did so, he told jurors.
Mack said Clancy was experiencing severe mental illness when she killed her children but that it was a continuation of the depression she had experienced for months in which she was able to control impulses and distinguish right from wrong.
He also said, "There's no reason that psychosis in and of itself inhibits a person's ability to know right from wrong."
If you or someone you know is struggling with thoughts of suicide, call or text 988 or chat 988lifeline.org. Free, confidential help is available 24 hours a day, 7 days a week. You are not on your own.
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