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Defense Attorney Seeks Mistrial Over Second Mention of 'Mortal Sin' During Trial
Crime By Michael A.G. · Aug 24, 2026

Defense Attorney Seeks Mistrial Over Second Mention of 'Mortal Sin' During Trial

Lindsay Clancy's defense attorney, Kevin Reddington, has moved for a mistrial after the term "mortal sin" was mentioned for the second time during her murder trial in Plymouth, Massachusetts. The case revolves around Clancy, 36, who is charged with killing her three children—Cora, 5; Dawson, 3; and Callan, 8—in their family home using exercise bands to strangle them.

During testimony from Dr. Kirk Heilbrun, a psychologist called by the prosecution to rebut the defense's claim of insanity, Heilbrun mentioned that Clancy had expressed her belief in going to Heaven with her children after strangling each one. When Heilbrun began discussing Catholic teachings on suicide and mortal sins, Reddington objected immediately.

Reddington argued that this was not an isolated incident but rather a pattern of misconduct by the prosecution. A week earlier, prosecutors had asked Clancy's mother-in-law if murder is considered a mortal sin, leading to a sidebar discussion where Judge William Sullivan instructed the jury to disregard the question. However, Reddington believes these repeated references are prejudicing the jury and undermining his client’s defense.

Assistant State Attorney Jennifer Sprague countered that Heilbrun's comments were not intentional and that she did not elicit them directly through questioning. She maintained that her line of inquiry was focused on establishing Clancy's state of mind at the time of the killings rather than invoking religious doctrine.

Judge Sullivan, while acknowledging the problematic nature of discussing religion in court, refused to grant a mistrial but emphasized his intention to instruct the witness and jury about the inadmissibility of such discussions. He instructed Heilbrun to avoid any further references to religious beliefs or implications related to Clancy's actions during the trial.

The case has garnered significant attention due to its tragic nature and the mental health issues surrounding postpartum psychosis, which Clancy’s defense team argues significantly impaired her judgment at the time of the murders. The repeated mention of "mortal sin" raises questions about how religious beliefs might influence jury deliberations in a secular legal system.

The trial continues with heightened scrutiny over the boundaries between psychological testimony and religious implications, as both sides navigate the delicate balance required to ensure a fair trial while presenting their respective cases effectively.

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