The knife-wielding attacker shot and killed by an off-duty Boston police officer after refusing to back down from terrorizing Chick-fil-A patrons in the Back Bay this weekend has been identified.

Surveillance footage from a liquor store near the Chick-fil-A in Boston’s Copley Square captured the “traumatizing” moment when dozens of people sprinted away after an off-duty police officer shot and killed a man wielding a knife inside the restaurant on Saturday evening.