In this case the victim was an unarmed teenager who was speeding and made the police office angry, so in response he cornered and shot him. It wasn't necessarily kill or be killed, unless I misunderstood you.

This happened in my hometown. The guy is a police officer from about ten towns over, and he was on a federal interstate when this happened in an unmarked car so of course the guy wouldn't pull over. He followed him to a pizza place just off the highway, cornered him, then shot him. We often have problems with police in the area being brutal for no reason and doing shit like this, so I am not surprised that this happened. But he shouldn't of been acquitted from it. Just more cops doing bullshit in a state that's supposed to be 'liberal'.