Disturbing video shows towering, knife-wielding woman gunned down after repeatedly stabbing cop

Disturbing bodycam video captured the moment a trained mental-health specialist was fatally shot by a veteran Virginia cop just seconds after she charged at him with a knife and repeatedly slashed him.

Sydney Wilson, 33, was fatally shot by Fairfax County officer Peter Liu in the hall of her apartment building in Reston, just outside Washington D.C., on Sept. 16 after cops were called to carry out a welfare check on her, police said.