Beating does not necessiarily casue death - maybe the beaten person dies of heart attack, for which he has been susceptible genetically from birth. Still, it seems reasonable to label beating-related deaths like that. A person having beaten and dying soon afterwards reasonably dies related to that. Analogically, a massive cyberbullying case that makes objectively mesurable neurotic symptoms is reasonably related to a death if the death occurs soon or in that context. Of course, the person may have emotional labilities from earlier, but, following the beating and heart attack analogy, I think the "no direct casue-and-effect" argument goes to far.