Lindsay Clancy's defense attorney filed a motion Friday seeking a judicial investigation into the holdout juror whose vote prevented a unanimous acquittal by reason of insanity in her high-profile murder trial.

Kevin Reddington asked Plymouth Superior Court Judge William Sullivan to examine the juror's background, jury questionnaire responses, and cellphone records from the deliberation period. The motion also requests preservation of all juror questionnaires, notes, and court responses, along with an on-the-record examination of the juror regarding any outside information or inaccuracies in his jury selection disclosures.

The request follows the Sept. 4 mistrial in the case, where 11 jurors voted to find Clancy not guilty by reason of lack of criminal responsibility. The holdout juror, identified as Michael Péguy Desronvil, favored a guilty verdict on charges that Clancy murdered her three children in Duxbury, Massachusetts, in January 2023.

Clancy's lawyers argued she suffered from postpartum psychosis at the time of the killings and was not criminally responsible. Prosecutors maintained she knew right from wrong and planned the acts.

Reddington's filing raises questions about Desronvil's truthfulness during voir dire and seeks records related to any domestic violence history or prior contacts with the Plymouth County District Attorney's Office. It also calls for an independent review of the juror's phone metadata to check for potential use of outside information during deliberations.

The motion states that any inquiry would avoid the substance of jury deliberations. Desronvil has stated publicly that he had no doubts about Clancy's guilt and felt the evidence supported conviction.

The mistrial left prosecutors to decide whether to retry the case. Clancy's defense has indicated plans to seek dismissal on double jeopardy grounds at a status hearing later this month.

The case drew national attention due to the circumstances of the deaths and the insanity defense presented at trial.