N.M. Stat. § 45-5-306
Death of protected person or guardian; incapacity of
guardian.
The authority and responsibility of a guardian for an incapacitated person terminates
upon the death of the guardian or protected person, the determination of incapacity of
the guardian or upon removal or resignation as provided in Section 45-5-307 NMSA
1978. Upon the death of the protected person, the guardian shall submit notice to the
appointing court. Testamentary appointment under an informally probated will
terminates if the will is later denied probate in a formal proceeding. Termination does
not affect the guardian's liability for prior acts nor the guardian's obligation to account for
funds and assets of the guardian's protected person.