Would it be wrong to pray for someone's death?

Question

If I knew someone was languishing in the hospital, suffering constantly and intensely, and about to die, while I can't physically do anything to hasten the death, can I add in my davening a request that, as an expression of God's mercy, the person die sooner rather than later? I don't know that the die has been cast and the death is necessarily inevitable because there could always be a miraculous recovery, so I would continue to hope and say "rofeh cholim", but can I word something to the effect that "if that isn't going to happen, better the person should pass quickly and soon instead of lingering and suffering"?

I am not asking about praying for the death of a specific wicked person (which brings this to mind) but at acknowledging that God meimit umechayeh (and that according to Kohelet 3:2, there is a time to die -- we can't all live forever), so if the person is constantly suffering, is there anything wrong for asking for the end to come?

I know that part of this hinges on the purpose and method of prayer as it relates to "Does prayer change God's mind" but if prayer can have any sort of effect, is it permissible to pray for such a course to come to pass?

Answer 1

Bava Metzia 84a:

Resh Lakish died, and R. Johanan was plunged into deep grief. Said the Rabbis, 'Who shall go to ease his mind? Let R. Eleazar b. Pedath go, whose disquisitions are very subtle.' So he went and sat before him; and on every dictum uttered by R. Johanan he observed: 'There is a Baraitha which Supports you.' 'Are you as the son of Lakisha?' he complained: 'when I stated a law, the son of Lakisha used to raise twenty-four objections, to which I gave twenty-four answers, which consequently led to a fuller comprehension of the law; whilst you say, "A Baraitha has been taught which supports you:" do I not know myself that my dicta are right?' Thus he went on rending his garments and weeping, 'Where are you, O son of Lakisha, where are you, O son of Lakisha;' and he cried thus until his mind was turned. Thereupon the Rabbis prayed for him, and he died.

then again, suffering atones for sins, so a person could greatly lose out by dying early thus it is a mercy that he suffers more and receives atonement in this world which is much easier than in the next. Presumably this was not the case for R.Yochanan who was a very righteous person.