Holdout juror in Clancy’s case, Michael Desronvil, sided with the prosecutors, arguing that Clancy knew what she was doing when she killed her three young children

Lawyers for Lindsay Clancy have asked a judge to investigate the conduct of the lone juror who wanted to convict the mother from Massachusetts of murder in the deaths of her three children.

In a motion filed Friday but made public Monday, Clancy’s lawyers asked the court to question the juror about his alleged use of a cellphone during deliberations, his truthfulness on a questionnaire that prospective jurors filled out before the trial began and his truthfulness when jurors were questioned by the judge a day before the trial ended.