The commanding officer of Fort Hood, Lt. Gen. Bob Cone, reported today that a civilian police officer was responsible for ending the massacre at the Army base.

Fort Hood police Sgt. Kimberly Munley and her partner arrived in under three minutes after receiving reports of gunfire on Thursday afternoon. According to General Cone, Sgt. Munley shot Nidal Malik Hasan four times and brought him down, despite being wounded by him twice during their exchange of fire.

Munley is hospitalized and in stable condition.

General Cone described Munley’s gunfight with the killer as “an amazing and an aggressive performance.”