If it's a justifiable homicide, a 'prosecutor' will never be part of the equation other than to render a 'no file' decision.
You can get sued by anybody for just about anything. May not go anywhere.
Plan your own course according to common sense and your own concerns.
“Nine-tenths of tactics are certain, and taught in books: but the irrational tenth is like the kingfisher flashing across the pool, and that is the test of generals. It can only be ensured by instinct, sharpened by thought practicing the stroke so often that at the crisis it is as natural as a reflex.” ~ T. E. Lawrence