Русско-англо-русский юридический словарь

Non-voluntary euthanasia occurs when the person is unconscious or otherwise unable (for example, a very young baby or a person of extremely low intelligence) to make a meaningful choice between living and dying, and an appropriate person takes the decision on their behalf. (BBC)

non-voluntary euthanasia – where a person is unable to give their consent (for example, because they're in a coma) and another person takes the decision on their behalf, perhaps because the ill person previously expressed a wish for their life to be ended in such circumstances. (NHS)