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On Oct. 2, 2016, Chad Murphy was in the middle of moving into a new condo with his father, an aging widower. The idea was for Murphy to move in with him and help out.

Murphy’s sisters and other family members spent the Sunday going back and forth from the condo in Île-Perrot, packing and unpacking.

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By the time Murphy arrived later in the afternoon, a sibling argument that had been brewing all day boiled over.

Stressed by the move and already struggling with depression, Murphy became agitated. He started yelling, demanding to speak with his father. His sister Sharon asked him to go home and calm down. He could speak with their father later on, she told him.

But Murphy, 45, erupted instead. He got in his car, drove it into his other sister’s car, backed up and did it again. Then he sped off, texting Sharon soon after: “you ain’t seen nothing yet.”

During the next couple of hours, the text messages kept escalating. Unsure of what to do — or where Murphy might be heading — the family decided to call the police. Sharon told them what had happened and gave them his cellphone number to track him down.