I'm guessing that his resignation is a defense strategy. Maybe his employment would require certain conditions or cooperation that you wouldn't want, as a defendant?
It also makes me sick that even FOX was reporting this as "another white officer shooting a black person" in the tease of the story.
Problem i have is that if i see people with flashlights in my fenced back yard by my bedroom window, I'd have a gun handy as well. But the pic of the guns show a gun on the floor as it that was justification.... maybe it was after she was shot and dropped it?