MONTREAL — A judge will rule in January whether a man who fatally stabbed his parents and grandmother inside their Montreal apartment in March 2023 is criminally responsible for the crimes.

The Crown and defence lawyers submitted arguments this week in the case and both agreed that Arthur Galarneau was not criminally responsible due to his mental state at the time of the triple murder.

Experts for both sides concluded he was suffering from schizophrenia.

Quebec Superior Court Justice Annie Émond says she’ll render a decision on Jan. 22.

Galarneau was facing charges of second-degree murder in the stabbing deaths of his 53-year-old parents Mylène Gingras and Richard Galarneau, and his 75-year-old grandmother Francine Gingras-Boucher.

If the judge agrees to the joint submission, the Crow

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