According to some raw video, the perp seems to be a young man of Nubian persuasion.
http://globalnews.ca/news/1271725/five-killed-in-stabbing-at-northwest-home/
It’s hard to tell from the raw video since they tried their best to blur out the perp’s features/characteristics.
But I’d say either Nubian or Middle Eastern.
What's a "Nubian"?