A Plymouth County jury spent seven days and roughly 38 hours behind closed doors trying to reach a verdict in the murder trial of Lindsay Clancy. On Friday, September 4, 2026, they told Judge William Sullivan they couldn't. He declared a mistrial — and one of the most closely watched criminal cases in Massachusetts history is now back in the hands of the district attorney who has to decide what happens next.
Clancy, 36, is a former labor-and-delivery, postpartum, and NICU nurse who worked at Massachusetts General Hospital. She was charged with three counts of first-degree murder after strangling her three children — Cora, 5; Dawson, 3; and Callan, 8 months — at the family's Duxbury home in January 2023. She then attempted suicide by jumping from a second-story window, an injury that left her paralyzed from the waist down. She has been held at a state psychiatric hospital for more than three years awaiting trial.
Clancy's defense argued she was legally insane at the time of the killings, in the grip of a severe postpartum psychosis. A defense psychiatrist testified Clancy heard voices commanding her to kill her children and "was just following the command rather than being able to make any decision." Prosecutors countered that Clancy understood exactly what she was doing and is criminally responsible for it — not mentally ill enough, under Massachusetts law, to be found not guilty by reason of insanity.
A deadlock that wouldn't break
Jurors reported being deadlocked at least twice in the days before Friday, prompting Judge Sullivan to give them the so-called "dynamite charge," which urges a hung jury to keep trying before giving up. It didn't work. The jury's final note read, in part: "It is with a heavy heart that we report we are unable to come to a unanimous decision." In a last-minute emergency motion, Clancy's attorneys asked the Massachusetts Supreme Judicial Court to intervene, arguing a holdout juror had disregarded the judge's instructions on reasonable doubt. The SJC rejected the appeal, and Sullivan declared the mistrial shortly after.
Because this was a hung jury rather than an acquittal, double jeopardy doesn't bar prosecutors from trying Clancy again. Plymouth County District Attorney Timothy Cruz said his office won't give "firm answers" on next steps until a hearing set for September 29, 2026, when he'll decide whether to retry Clancy on the original first-degree murder charges, pursue a lesser charge, consider a plea, or decline to retry the case at all. In his first public statement after the mistrial, Cruz left little doubt about how his office sees the underlying facts, describing the case as "the cruel and calculated killing of three innocents."
I've spent time on both psych units and postpartum-adjacent care, and this case sits right at the intersection of everything I think about in both. Postpartum psychosis is rare — nowhere near as common as postpartum depression or anxiety — but it's a true psychiatric emergency, and Clancy herself was clinically trained to recognize warning signs in other new mothers. That she was reportedly under active psychiatric treatment in the weeks before the killings, and it still didn't prevent this outcome, should worry every L&D and postpartum nurse who screens for it at every visit. None of that is an argument for or against her legal responsibility — that's what the jury couldn't agree on, and it's not my job to referee it. But it's a hard reminder that screening tools and check-the-box questionnaires aren't a substitute for someone actually escalating a mother in crisis to real psychiatric care, fast.
What comes next
Clancy remains held at a state psychiatric hospital while Cruz's office weighs its options ahead of the September 29 hearing. Separately, Clancy has filed a civil medical malpractice lawsuit against Tufts Medical Center and other providers who treated her psychiatrically in the weeks before the killings, alleging her care failed to catch how dangerous her condition had become — a case that will keep moving regardless of what the DA decides on a retrial. Neither Clancy's criminal defense team nor the Plymouth District Attorney's office has indicated a retrial timeline beyond the September 29 hearing date.