The murder trial of Massachusetts mother Lindsay Clancy ended in a mistrial on Friday after jurors failed to reach a unanimous verdict over whether she was criminally responsible for the deaths of her three young children.
The development came on the seventh day of jury deliberations, leaving unresolved one of the most closely watched US criminal cases involving postpartum mental health and criminal responsibility.
Clancy, 36, had been accused of killing her children-five-year-old Cora, three-year-old Dawson and eight-month-old Callan, at the family’s home in Duxbury, Massachusetts, in January 2023.
She does not dispute that she killed the children but has pleaded not guilty by reason of lack of criminal responsibility.
Her defence argued that she was suffering from severe postpartum psychosis at the time of the killings and therefore could not be held criminally responsible for her actions.
Prosecutors, however, maintained that although Clancy had significant mental-health problems, she was not psychotic when she killed her children and deliberately carried out the acts. They argued that she had taken steps to get her husband out of the house before the killings.
The 12-member jury had deliberated for more than 36 hours over seven days and reported repeatedly that it could not reach a unanimous decision.
A note from the jury indicated that it remained deadlocked despite repeated efforts by Judge William Sullivan to encourage the jurors to reconsider their positions and reach an agreement.
The case became particularly tense during the final days of deliberations after Clancy’s defence lawyer, Kevin Reddington, raised concerns about the conduct of a juror whom he alleged was refusing to follow the judge’s instructions concerning reasonable doubt.
The judge declined to remove the juror, saying the juror had indicated an ability to follow the law. An emergency attempt by the defence to halt the mistrial was subsequently rejected by Massachusetts’ highest court.
With the jury unable to resolve the case, Judge Sullivan declared the mistrial. The case turned largely on competing accounts of Clancy’s mental state before and during the killings.
The defence presented evidence that her mental health had deteriorated dramatically following the birth of Callan. Testimony described severe anxiety, sleep deprivation, suicidal thoughts and what she described as debilitating “brain fog”.
Her family members also testified about her deteriorating condition and attempts to obtain psychiatric assistance.
A defence forensic psychiatrist, Dr Phillip Resnick, testified that Clancy was experiencing psychosis and was not in control of her actions when she killed the children. He also suggested that she may have been experiencing bipolar disorder.
The prosecution’s forensic psychologist, Kirk Heilbrun, disputed that account. He testified that he did not believe Clancy was experiencing acute psychosis when she killed the children and questioned aspects of her account, including her claim that she heard voices.
The prosecution also pointed to evidence suggesting planning and argued that Clancy viewed her children as an obstacle to ending her own life.
The trial lasted 21 days and included testimony from 85 witnesses, according to CBS News.
Among the most emotional evidence was testimony from Clancy’s former husband, Patrick Clancy, who described returning home and discovering the children.
Prosecutors also played a 911 call from the scene, capturing his distress as he discovered what had happened.
Patrick has publicly said that he forgave Lindsay and has maintained that her actions were connected to her mental illness.
After killing the children, Clancy attempted suicide by jumping from a second-storey window. She survived but suffered injuries that left her paralysed.
The mistrial does not amount to an acquittal and does not end the criminal case.
Clancy remains in custody and under psychiatric care at Tewksbury State Hospital while prosecutors consider their next move.
The Plymouth County District Attorney’s Office must now decide whether to seek a retrial, pursue another resolution such as a plea agreement, or decline to prosecute the case again.
A further court hearing has been scheduled for September 29, when the next steps in the case are expected to be addressed.
