WASHINGTON — Prosecutors say no charges will be filed against an off-duty Baltimore County police officer who fatally shot a knife-wielding man at Washington’s Union Station last year.

The U.S. Attorney’s Office for the District of Columbia announced Friday that it had completed its review of the Nov. 14, 2015, shooting of Rashad Bugg-Bey. It found insufficient evidence that the officer used excessive force.

Prosecutors say 25-year-old Bugg-Bey had slashed a female relative’s face with a knife at Union Station. The off-duty Baltimore County officer saw the woman screaming and running.

They say the officer stepped on an escalator as did Bugg-Bey. Prosecutors say the officer identified himself and told Bugg-Bey to drop the knife but he didn’t, leading to the shooting. Bugg-Bey died weeks later.