I don't know the legal stuff, either, but why would one NOT report justifiably killing someone?
Lots of reasons, most of them involving time, hassle, money, reputation, and possibility of incarceration or lawsuit, regardless of how "clear cut" the situation appears to the shooter.
But that's not the question.
Seems to me, in IANAL armchair legal opining mode, you flee the scene:
- if you are never connected to the shooting, obviously you wouldn't be charged with anything.
- if you are, default perception would almost certainly shift from justifiable homicide to criminal homicide of some flavor, up to even premeditated murder if you happened to know the person.
Additional charges?:
Homicide is a crime until deemed justifiable.
Would think that leaving scene could be construed as unlawful flight to avoid prosecution, cross a state line and it becomes federal crime too, AFAIK.
I imagine you could be found guilty of this, even if found not guilty of anything in the shooting itself.
Just like fleeing the scene of an accident, except more serious.
There's also a charge of "interfering with an investigation" or similar, off top o' my bean.
- OS