Praying that a patient die.

Igros Moshe (Choshen Mishpat II #74.4) Question Praying that someone die.  Answer The Ran based on the gemora about Rav Chanina Ben Dosa says one can pray that someone die or at least withold prayer. He is referring to people on a very high level whose prayers are readily accepted. However this is only about prayer. No action is permitted which shortens life even if done for the good of the patient and in fact is murder which is punished by death just as a murder done from hatred or anger