Lindsay Clancy’s murder trial ended in a mistrial after a Massachusetts jury, following more than a week of deliberations, said it could not reach a unanimous decision. The outcome delivers no finding on the competing accounts that dominated the weeks-long case.

The jury told Judge William Sullivan: “It is with a heavy heart that we report we are unable to come to a unanimous decision and will not be able to.”¹ After repeated reports of deadlock, Sullivan declared a mistrial; an emergency request by the defense to halt that step was denied.

Clancy has acknowledged killing her children, Cora, Dawson and Callan, but pleaded not guilty on the grounds of lack of criminal responsibility. Prosecutors argued that she deliberately arranged time alone in the family home and carried out intentional killings. Her defense instead maintained that postpartum psychosis, depression and medication issues left her unable to understand or control her actions.

The defense’s position was summed up by forensic psychiatrist Dr. Phillip Resnick, who testified: “At the time of the crime on Jan 24, 2023, Ms Clancy was frankly psychotic.”² Prosecutors, by contrast, treated the circumstances surrounding the deaths as evidence of planning rather than a psychiatric break.

The deadlock also sparked a dispute over the deliberations themselves. Defense lawyer Kevin Reddington argued that a holdout juror was biased and not properly applying the court’s reasonable-doubt instructions; the court did not remove the juror. A later account said 11 jurors had reached a common position, though the jury’s deliberations and votes have not been publicly detailed.³

A mistrial is neither an acquittal nor a conviction. Prosecutors can seek a retrial with a new jury, negotiate a plea, or dismiss the case, though legal observers said a retrial is common in serious felony cases.⁴ A future hearing is expected to determine the next procedural steps.