D.C. police on Sunday identified the man fatally shot Friday by a private security guard at Union Station.

Police said William Thomas Wilson Jr., 57, of Southeast D.C., was shot after he threatened the security guard and refused to drop the knife he had used to stab a woman outside the station. The shooting, which occurred about 12:45 p.m., took place near the McDonald’s and multiple Amtrak gates.

Police said Friday that the security guard fired his gun only once. Travelers were evacuated and train service was suspended for a short time after the incident.