In the absence of a document establishing an agent's right to act or a court order expressly authorizing such action, an attorney in fact, custodian, conservator, or other agent of the transferor may not make, change, or revoke a beneficiary designation on a transfer on death deed. However, this does not prohibit or limit the agent's ability to sell, pledge, or otherwise enact a present transfer of the property during the transferor's life with such express authorization, in effect, extinguishing the designated beneficiary's right to receive the property upon the transferor's death.
SDCL app TO CHAPTER 43-30 § 17-07