 That's when she might be assessed by doctors as not having the capacity to decide for herself that she wants to die. In later stages of dementia, those seeking euthanasia in the Netherlands must have prepared an advanced directive. This must be written down and be clear about the point at which they want to be given an infusion that will kill them in the future when they aren't able to ask for it themselves. Often on paper, it's not specific enough. Dr. Rosmarin van Bruchem again.