Retreating down the hall, Liu is heard telling Wilson to back away. But she continued attacking Liu with the knife.
Finally, Liu opened fire and shot her three times. She was rushed to the hospital, where she died of her injuries.
At a Monday press conference, Chief Kevin Davis said Liu responded properly in the face of the violent, unprovoked attack.
“He did the things that we trained him and expect him to do when you’re threatened like that," he said. "If you can tactically reposition yourself, you do it. If you can use distance, use it. If you can seek cover and concealment, seek it. All those options weren’t available to him.”
Liu also was taken to the hospital and treated for injuries to his face.