Myles Sanderson, who was arrested hours ago, was an ex-con with a long history of shocking violence and had been wanted by police since May for violating the terms of his release.
A manhunt for the second suspect is under way as Canada flies its flag above Parliament at half-staff to honour the victims.
The attacks in multiple locations across the James Smith Cree Nation and in the village of Weldon on Sunday triggered a manhunt across several Canadian provinces for two suspects.
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