I am not at all convinced that physicians always know when death is near, or when a condition is "irreversible." This story reminded me of the Terry Schiavo murder a few years ago. Here's the summary:
May 5, 2008
Last winter, just as the state’s highest court was about to rule that a girl in an "irreversible vegetative state" should be removed from life support, 14-year-old Haleigh Poutre started to breathe on her own.