Often it's a matter of body language and eye contact to suss out whether I'll be narrating the death as DM or if the player wants to. So no words really are spoken about it – we're just in the narrative flow, and depending on the situation I might do it, they might do it, or it might simply go un-described. If I'm unsure of the player's intent (which I notice happens a lot more playing over Zoom), I'll ask them, "Did you have something in mind?" or "What does Grolandor do?"