I made that decision for both of my parents and it was a calm and dignified ending. It can only happen though if the person is on some sort of treatment. This can then be withdrawn and the morphine pump put into place. It usualaly takes forty eight hours from then. It is not an easy decision but if you consider them and their situation rather than how much you, yourself, will miss them it becomes much clearer as to what you should do.
Taz x