I think the TWG is directly responsible for Murphy demise, I don't know why. Perhaps because she was not going to be happy ever again with so many injuries, perhaps because He needs that Harry losses her. I don't know. But Murphy did a wonderful thing, deserving a reward and perhaps Rest is the reward.
Why do I say that he is responsible, because too many "random" things led to Murphy's death. Bradley couldn't move with his daughter and Rudolph at the same time, so Harry and Murhpy asked him to leave Rudolph. The gun dropped to the floor and no one had the time to take it. Then Rudolph completely freak out. And Harry suddenly (not before that) discovered that he couldn't raise his arm for a Forzare. I just think there are too many "coincidences" and I only can see the TWG as having that control over reality.