MONTREAL - A man who stabbed his parents and grandmother to death inside their Montreal home in March 2023 should be found not criminally responsible for the crimes, both the prosecution and defence told a courtroom on Thursday.

In a joint submission, the Crown and defence said Arthur Galarneau, 22, was suffering from a mental illness at the time of the triple murder. The evidence presented in court included testimony from a psychiatrist who concluded Galarneau was suffering from schizophrenia and could not be held responsible for his actions.

During a two-day hearing that concluded Thursday, details about what happened on March 17, 2023, were released publicly for the first time. The murders, prosecutor Anne-Andrée Charette told the court earlier this week, "represent the culmination of

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