Clancy has acknowledged killing her three young children at the family’s home in Duxbury in 2022, but her attorneys argue that severe mental illness impaired her judgment and contributed to the deaths.
The prosecution’s presentation focused on the events surrounding the killings and evidence intended to establish Clancy’s criminal responsibility.
The defense is expected to emphasize her deteriorating mental health, including claims that she experienced a rare psychiatric condition and was affected by medication.
Clancy faces multiple murder charges. The case has drawn intense public attention because it combines allegations of family violence with difficult questions about mental illness and accountability.
After the defense presents its evidence, both sides will deliver closing arguments before the jury begins deliberations. A verdict could determine whether Clancy is held legally responsible for the deaths or whether the jury finds that her mental state prevented her from forming the required intent.