I agree, out-of-control cop. But I don’t see a 1st Degree Murder charge sticking. That requires malice and premeditation. Maybe 2nd Degree.
Unfortunately, I think the charges will be downgraded to voluntary manslaughter. (Strongly provoked and heat of passion reaction.) They can make that stick and get a good conviction from it.
First seven shots in rapid succession, heat of passion maybe.
Last shot came after a longer interval — in which he must have been thinking something, but perhaps only hitting his target.
I predict he’ll be sent to prison, and be “rehabilitated” and out in record time.