Why did a group of teenage girls kill a homeless man at random?

If you were in the Yorkdale Shopping Centre in Toronto on December 17, 2022, you might have come across a very normal scene: a group of teenage girls hanging out. They were rowdy and obnoxious, like most teens having fun. Some of them would eventually head to a house party, but for eight of the girls, their night would end much differently. Those eight girls ended up arrested for the murder of Kenneth Lee in what would later be deemed a "swarming attack."

The news shocked the city. What happened? How could this have happened? 

Journalist Inori Roy wrote about this case for The Walrus. She's here to make sense of that night.