Living Will, Signing By Another Person
A principal who is physically incapable of writing his or her own signature may have another person sign a living will on his or her behalf. When this is done, the other person actually writes the principal's signature on the document.

All living wills must have two subscribing witnesses and are invalid without them.  Neither of these witnesses may be the same person who signed on behalf of the principal.  A health care provider who is actually providing health care services to the principal is prohibited from signing on behalf of the principal.

See: Witnesses, Generally; Living Will, Generally; Witnesses, Eligibility; Living Will, Who May Create; Living Will, Signing By Mark