The Uvalde gunman's co-workers nicknamed him 'school shooter' before the attack that killed 21 people

A former co-worker of the Uvalde shooter told The New York Times that he and other workers at the local Wendy's had nicknamed him the school shooter.

According to the New York Times, the co-worker of the shooter said he would frequently snap at colleagues and customers. They called him names because of his long hair and dark clothing.

Nineteen students and two teachers were killed when he opened fire on an elementary school classroom.

Multiple people told The New York Times that the shooter was aggressive and intimidating. He frequently discussed and threatened violence, posting pictures of guns online and sending harassing messages to girls.

He would reply to my stories with things like "I wanna kill you" or "I hate you".