Lindsay Clancy Trial: Diagnosis Chaos and a $300K Question for the Prosecution's Expert

Monday's session in the Lindsay Clancy trial belonged to the defense, as attorney Kevin Reddington took apart prosecution rebuttal witness Dr. Avram Mack piece by piece. Clancy, the 34-year-old Duxbury, Massachusetts mother accused of strangling her three children — 5-year-old Cora, 3-year-old Dawson, and 7-month-old Callan — with exercise resistance bands inside the family's Summer Street home on January 24, 2023, faces three counts of murder and three counts of strangulation. She's pleaded not guilty, and her defense rests on an insanity argument built around severe postpartum psychosis and psychiatric overmedication.

Reddington's cross covered a lot of ground fast. He brought up past cases where Mack was found not credentialed enough to testify, then asked about money — Mack said expert testimony nets him several hundred thousand dollars a year. Reddington had him define confirmatory bias, then asked if he'd exhibited it evaluating Clancy; Mack said no. Mack testified his own evaluation didn't happen until 2026, three years after the incident, and that he came in already holding defense records, DCF files, and medical history. The actual sit-downs with Clancy ran about eight hours combined across two doctors, plus a separate day of psychological testing. He also laid out the diagnostic disagreement at the heart of this case: Drs. Heilbrun, Resnick, and Zeizel diagnosed bipolar 2, a different doctor diagnosed bipolar 1, and Mack pointed out postpartum psychosis doesn't even appear in the DSM as a standalone diagnosis.

Prosecutors still intend to argue Clancy knew what she was doing at the time. After the killings, Clancy allegedly attempted suicide by jumping from a second-story window, leaving her paralyzed from the waist down. Her husband, Patrick Clancy, was out running errands and has since relocated to Manhattan. The trial continues in Plymouth Superior Court.

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