The stabbing attack at the Crossroads Center mall in St. Cloud, Minnesota, could have been much worse, if not for the actions of an off-duty police officer.

That officer — identified as Jason Falconer — fatally shot Dahir Adan on Saturday after Adan had already stabbed nine people and threatened other shoppers.

Here’s what we know about Falconer:

He’s a firearms training instructor

He owns a firing range and firearms training facility called Tactical Advantage. He’s considered an expert in firearms training and education and has helped teach classes on law enforcement skills at St. Cloud State University for nine years, his company website says.

He’s a member of the United States Practical Shooters Association and has won medals in various shooting competitions.

He was a former police chief

Falconer was the former police chief of Albany, Minnesota. Now, he works as a part-time officer with the Avon Police Department.

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Image courtesy of AP