A man identified as suffering from schizophrenia stabbed his parents and his grandmother to death in the Rosemont neighbourhood of Montreal on September 18, 2026. The killings, which occurred at approximately 14:04 EDT, resulted in three victims and prompted a criminal proceeding that later classified the offender as a high‑risk individual.
The incident was reported to police shortly after the attacks, and investigators confirmed that the victims were the perpetrator's mother, father and grandmother. All three were found deceased at the residence in Rosemont. The suspect was taken into custody at the scene and transferred to authorities for questioning.
Following the investigation, a court hearing assessed the man's mental health status. Based on his diagnosis of schizophrenia, the judge deemed him a high‑risk offender. The ruling mandated that he remain confined in a psychiatric institute rather than a conventional prison, citing the need for ongoing treatment and public safety considerations.
The psychiatric institute where the man will be held is responsible for providing continuous care and monitoring, as required by the court order. Officials from the institute have not released further details about the treatment plan, citing privacy regulations.
This case adds to a series of violent incidents involving individuals with severe mental illness in the province, prompting local authorities to reaffirm the importance of mental health assessments in criminal proceedings. No additional arrests or suspects have been reported in connection with the Rosemont homicides.
The families of the victims have not issued public statements, and community members in Rosemont have been advised to avoid the immediate area while police and health officials continue their work. The investigation remains closed, with the high‑risk designation and psychiatric confinement representing the final judicial action taken in the matter.