And he didn’t intend to kill the person in question, so arguably it is only manslaughter (negligence) though usually when you try to murder someone, bungle, and kill a bystander it is prosecuted as premeditated murder (the difference under traditional English law was the difference between the gallows and having to move to America or Australia).
But would we really want a headling saying “INCOMPETENT HAREIDI MANSLAUGHTER”