The tension inside the Massachusetts courtroom was palpable on Thursday as a forensic psychiatrist with the FBI’s Behavioral Analysis Unit delivered a devastating final blow to the defense of Lindsay Clancy, the Duxbury mother accused of strangling her three young children in January 2023. Dr. Gregory Sadhoff, the prosecution’s final rebuttal witness, told the jury that despite Clancy’s severe mental health struggles, she was criminally responsible for the deaths of five-year-old Dawson, three-year-old Callan, and eight-month-old Kora.
“It is my opinion within a reasonable degree of medical certainty that Miss Clancy was criminally responsible,” Sadhoff stated, a conclusion that now hangs over the jury as they prepare to deliberate following closing arguments.
The testimony came after weeks of dueling narratives, with the defense arguing that Clancy, 35, was in the grips of postpartum psychosis and acting on the command of a hallucinated male voice that told her to 𝓀𝒾𝓁𝓁 her children and then herself. The prosecution, however, has painted a picture of a woman who meticulously planned the murders, researched distances to a restaurant and a pharmacy, and deliberately manipulated her husband’s schedule to create a window of time to carry out the killings. Sadhoff’s testimony on Thursday sought to dismantle the defense’s core claim, asserting that the voice Clancy described was inconsistent with clinical patterns seen in thousands of psychosis patients he has evaluated over a decades-long career.
The courtroom atmosphere was electric, with a packed gallery that included supporters of Clancy, some of whom brought flowers and even a dog, according to Law & Crime reporter Sierra Gillespie, who has been present for every day of the trial. The jury, which had appeared fatigued during earlier technical testimony, was visibly alert and engaged during Sadhoff’s cross-examination, with several members leaning forward as defense attorney Kevin Reddington aggressively challenged the psychiatrist’s credentials and conclusions. At one point, the tension broke into an audible laugh from the jury after Reddington repeatedly referred to prosecutor Jennifer Sprague as “Jen Sprag,” prompting a sharp correction from the judge and a moment of levity in an otherwise grim proceeding.
Sadhoff, who has worked with the FBI since 1996 and has treated thousands of patients with psychosis, testified that Clancy told him she heard a man’s voice that was “very clear” and “external,” repeating the phrase “this is your last chance, you have to 𝓀𝒾𝓁𝓁 your kids and then 𝓀𝒾𝓁𝓁 yourself” over and over. However, he noted that the voice began only on the day of the killings and stopped abruptly after the children were dead, a pattern he said he had never encountered in his career. “Committing the act is not curative of the voice,” Sadhoff testified, adding that command hallucinations typically persist and are not silenced by the completion of the act.
He also highlighted the order in which Clancy killed her children—Dawson first, then Kora, then Callan—as evidence of deliberate, sequential action rather than a psychotic break.
The defense, led by Reddington, fought back fiercely, pointing out that Sadhoff is not board-certified in forensic psychiatry and has not treated a patient with postpartum psychosis since the 1990s. Under cross-examination, Sadhoff conceded that Clancy was suffering from a mental disease or defect, specifically diagnosing her with bipolar II disorder, and acknowledged that her symptoms, including intrusive thoughts of harming her children, were worsening in the weeks before the killings. He also admitted that the medication she was prescribed, including Zoloft, may have exacerbated her condition, and that her doctors failed to perform basic tests, such as a thyroid panel, that could have provided crucial insight into her deteriorating mental state.
Despite these concessions, Sadhoff remained steadfast in his opinion that Clancy could appreciate the wrongfulness of her actions and conform her behavior to the law. He pointed to specific behaviors that he said demonstrated her awareness and control, including her research into the distance to 3V Restaurant and CVS, her decision to text her husband Patrick about takeout, and her timing of a phone call to him while he was at the pharmacy. “She was conscious of time and told me that she had mapped out the distance because she didn’t want her husband to be gone too long,” Sadhoff testified.
He also noted that Clancy locked the door to the basement office where the children were killed, a move he said was designed to delay her husband’s discovery of the scene.
The prosecution’s case has rested on the argument that Clancy’s actions were not the result of a sudden, uncontrollable psychotic episode but rather a calculated series of decisions made over a 45-minute window while her husband was out running errands. They have emphasized that Clancy did not call for help or alert her husband during their phone conversation, despite having previously confided in him about her dark thoughts. The defense, however, has countered that Clancy was disassociating, acting on autopilot, and unable to process the horror of what she was doing, pointing to her inability to recall how she lured her children to the basement or how they reacted as they were being strangled.
The trial has been a battle over who gets to tell the story, and the jury now faces the daunting task of deciding whether Clancy should be held criminally responsible for the deaths of her children. Under Massachusetts law, a person is not criminally responsible if, at the time of the act, they were suffering from a mental disease or defect that prevented them from appreciating the wrongfulness of their conduct or from conforming their behavior to the law. The defense must prove that Clancy meets at least one of these criteria, while the prosecution must convince the jury that she was capable of both.
Dr. Kirk Halburn, another prosecution expert who testified earlier in the week, conceded under cross-examination that Clancy was having adverse reactions to her medication and that her condition was deteriorating, but he also maintained that she was criminally responsible. The defense has seized on these concessions, arguing that the system failed Clancy, who was prescribed a cocktail of drugs by a psychiatrist with only two months of experience and who was never given a blood test to monitor her levels.
“You got this girl living in her house with her kids saying she’s having dark thoughts, saying she’s thinking of harming the children,” Reddington argued during cross-examination. “And Patrick’s response, according to your testimony, is just basically just power through it. You’ll be okay.”
The case has drawn national attention, with many mothers and mental health advocates following closely, as it raises difficult questions about postpartum mental health, the role of medication, and the limits of criminal responsibility. Clancy, who has been in custody since her arrest, appeared somber and exhausted in court, closing her eyes and taking deep breaths during the heated cross-examinations. Her family, seated behind her, also appeared drained, their shoulders slouched as they listened to the graphic details of the killings and the intimate journal entries that have been entered into evidence.
As the trial nears its conclusion, both sides are preparing for closing arguments, which are expected to take place on Friday. Reddington, who has been praised for his courtroom tactics and his ability to connect with the jury, is expected to deliver a passionate, note-free closing that emphasizes the failures of the mental health system and the tragic circumstances that led to the killings. The prosecution, led by Jennifer Sprague, is likely to focus on the evidence of premeditation and the emotional impact of the case, reminding the jury of the children’s clothing and the 911 call that captured the aftermath of the murders.
The jury, which has been sequestered for the duration of the trial, will then begin deliberations, a process that legal experts predict could be lengthy given the complexity of the case and the conflicting expert testimony. “I think this is going to be a long deliberation process,” said Jesse Weber, host of Law & Crime’s Sidebar. “I don’t even know if the jury’s going to get on the same page.
I’m curious whether or not this could be a mistrial.” The stakes are immense: if convicted of first-degree murder, Clancy faces life in prison without the possibility of parole, while a verdict of not guilty by reason of insanity would result in her commitment to a psychiatric facility.
Outside the courtroom, the scene has been a mix of media frenzy and quiet support for Clancy, with some observers drawing comparisons to other high-profile cases involving mothers who killed their children. However, the mood inside the courtroom has been somber, with the gravity of the proceedings weighing heavily on all those present. As the trial enters its final phase, the nation watches, waiting to see whether the jury will hold Lindsay Clancy responsible for the unthinkable act or find that her mind, broken by postpartum psychosis and a cascade of failed treatments, was not her own on that tragic January day.
