C.R.S. § 15-18-105

(1) In the event that the declarant is physically unable to sign the declaration, it may be signed by some other person in the declarant’s presence and at the declarant’s direction. The other person shall not be: (a) The attending physician or any other physician; (b) An employee of the attending physician or health-care facility in which the declarant is a patient; (c) A person who has a claim against any portion of the estate of the declarant at his or her death at the time the declaration is signed; or (d) A person who knows or believes that he or she is entitled to any portion of the estate of the declarant upon the declarant’s death either as a beneficiary of a will in existence at the time the declaration is signed or as an heir at law.