There's a book out with accounts of actual lethal force incidents involving cops called "Into the Kill Zone." One of the stories involves a lady on DV call who threw a knife at a cop (IIRC it was 30 or 40 feet), and hit him in the head, with the knife sticking straight into his forehead. He lived, but the docs told him if the knife had penetrated another 1/16th of an inch he would have likely died or suffered permanent disability. Later in his career he killed a male suspect on a DV call that brought out a knife.I always taught officers that a thrown knife represented danger of death or serious bodily injury for defensive shooting purposes, but went on to tell them I'd never heard of anyone ever actually being killed with a thrown knife. I stand corrected!