Really? I can’t get to murder and barely get to manslaughter.
Maybe negligent homicide but, that would take some work as well.
A charge of Murder goes to “intent” and I don’t see it.
Any charge requires mens rea. If he was attacked, there is none. There was no criminal intent on Z’ s part. If I understand correctly, he was in the LEO academy. I still don’t sit in a restaurant with back to the door since then. Identifying criminal behavior is instilled during those three months to the point of paranoia. All cops or potential cops are taught this.
Anti-gunners see carrying a weapon as intent.