In a pivotal court appearance on Tuesday, Lindsay Clancy directly engaged with the judge by consistently responding, “Yes, Your Honor.” She concurred with allowing prosecutors to presume specific forensic details as factual, merely hours before a state police trooper revealed the absence of any discernible fingerprints on either a knife or three exercise bands.
This progression steers the Massachusetts mother’s murder trial toward the heart of the matter: determining Clancy’s criminal responsibility in the tragic deaths of her three children within their Duxbury household.
Prior to the jury’s entrance, Judge William Sullivan addressed Clancy regarding an agreement pertinent to certain pieces of evidence.
“You acknowledge that by signing this stipulation, you concede that the prosecution need not establish these specific facts included in the agreement,” Sullivan clarified. “Is that understood?”
Clancy confirmed, “Yes, Your Honor.”

Defendant Lindsay Clancy listens during her murder trial at Plymouth Superior Court in Plymouth, Mass., on Thursday, July 30, 2026. (CJ Gunther/The Boston Herald via AP, Pool)
Asked whether anyone had forced or threatened her to accept the agreement, Clancy said, “No, Your Honor.”
Sullivan found that Clancy was competent and had entered the stipulation “knowingly, intelligently, voluntarily and willingly.”
Defense attorney Kevin Reddington said the agreement would prevent prosecutors from calling dozens of witnesses solely to establish the chain of custody for blood, bodily fluids, exercise bands and DNA evidence.
“We have not been contesting the government’s case in chief, if you will,” Reddington said.
The stipulation is not a guilty plea or an admission that Clancy was criminally responsible for the deaths of Cora, 5, Dawson, 3, and Callan, 8 months.
Margaret McLean, a former criminal prosecutor and trial attorney who teaches law at Boston College’s Carroll School of Management, said the agreement allows the defense to steer jurors away from repetitive forensic testimony and toward Clancy’s mental state.
“The legal strategy behind the move by the defense is to steer the jury’s focus away from the horrific nature of the acts and to that central issue of criminal intent, or what we would call mens rea,” McLean told News Media.
McLean said Clancy’s measured responses Tuesday should not be taken as evidence of her mental condition on Jan. 24, 2023.
“She sounded rational. She understands what she’s doing,” McLean said. “But remember, the Commonwealth’s burden of proof is to prove that she was sane beyond a reasonable doubt at the time the crimes were committed — not today, not two weeks ago.”
Later, Massachusetts State Police Trooper Jonathan O’Loughlin testified about examining a knife and three exercise bands collected from the home.
O’Loughlin said the knife contained an area of friction-ridge impression, but investigators could not use it to identify anyone.
“There was not enough characteristics or minutia to do any comparison,” O’Loughlin said, adding that the impression had “no value.”

Defendant Lindsay Clancy on Monday, Aug. 3, 2026, the fifth day of testimony at Plymouth Superior Court for her murder trial. Clancy is charged with three counts of murder in connection with the death of her three young children in 2023 at their Duxbury home. Clancy says she was suffering from postpartum psychosis and is not criminally responsible. (Greg Derr/Pool/The Patriot Ledger)
The yellow, black and blue exercise bands similarly produced no impressions suitable for comparison.
“The bottom line is that you didn’t get any fingerprints,” Reddington said.
“Correct,” O’Loughlin replied.

Lindsay Clancy’s three children, 5-year-old Cora, 3-year-old Dawson and 8-month-old Callan. (Lindsay Marie Clancy facebook)
O’Loughlin said fingerprints are “very, very, very fragile” and can be affected by an object’s texture, environmental conditions, movement, grip strength or whether a surface was wiped.
McLean said the absence of identifiable prints could make jurors wonder whether gloves were used or the items were wiped, potentially viewing the missing prints as evidence of planning.
The defense, she said, can counter that jurors must not “speculate on something that’s not in evidence.”
“They can use their common sense when they go to the table and they deliberate,” McLean said, “but they can’t speculate [about] things that are not in the evidence.”