After nearly seven weeks of testimony in Plymouth, Massachusetts, the jury of nine women and three men could not reach a unanimous decision on any of the charges — including first-degree murder, second-degree murder, manslaughter, not guilty, or not guilty by reason of insanity. The judge then declared a mistrial, leaving Clancy's fate uncertain and setting the stage for a likely retrial.
Clancy does not dispute that she killed her children — Cora, 5, Dawson, 3, and eight-month-old Callan — in the basement of their family home in 2023. She also attempted suicide that day, an act that left her partially paralysed and in a wheelchair throughout the trial.
The central question for the jury was whether Clancy was suffering from postpartum psychosis — a rare condition affecting roughly one in 1,000 mothers — at the time of the killings, and therefore not criminally responsible.
Her defence team argued that she hallucinated a voice after giving birth to her youngest child that told her to kill the children, and that she was "begging for help" in the months before the tragedy. Her lawyer, Kevin Reddington, challenged the prosecution's narrative during closing arguments, asking jurors why the defence would have spent a week showing she committed a serious suicide attempt if the killings were calculated.
The prosecution, led by Assistant District Attorney Jennifer Sprague, argued that Clancy was a "functioning mom" who made an intentional, calculated decision to kill her children because she was "done with being their mother." The state sought to prove beyond reasonable doubt that she knew right from wrong even if she suffered from a mental illness.
The trial captivated the American public, with supporters of Clancy wearing pink outside the courthouse and others arguing strongly for a conviction. The split in the jury mirrored divisions across the country — and even within families. One trial attendee, Maryanne Drysdale, 65, described how she and her daughter believe Clancy needs mental health treatment, while her three adult sons see it differently. "It's black and white for them, [Clancy] killed the kids and that's that," she said.
Under Massachusetts law, a not guilty by reason of insanity verdict would result in Clancy being detained at a mental health facility. A not guilty verdict — considered highly unlikely — would set her free. The prosecution carries the burden of proving beyond reasonable doubt that Clancy was criminally responsible.
What happens next is unclear. The prosecution may choose to retry the case, or the defence could seek a negotiated resolution. A status conference is expected in the coming weeks.