I have the feeling there is may be some back story there, and that the police may know the deceased from other incidents.
Shooting fleeing suspects is kinda sketchy for me as far as 'self defense' goes, but they may have been running to get a gun to carry on the altercation, too. Without audio, it's hard to say whether it is a good shoot or a bad one.
(
needs context or something like that...

)