I found myself thinking that attempted murder maybe wouldn't be the right charge because you have to prove intent, but then I thought what would happen if it wasn't a cop doing the shooting? Odds are decent attempted murder would be the charge. And if it was someone who shot at an off-duty cop (without knowing their identity)? Guaranteed attempted murder charge.
Face it private citizens: Cops are just above the law.
Just pointing a gun at someone is technically assault with a deadly weapon. In general in court if you point a gun at someone's head (or anywhere else above the waist) and pull the trigger, that is attempted murder. There is absolutely no reason this man should ever be free, or own a gun again, let alone be employed as a police officer.