SDCL § 55-19-22: Request for termination of user's account.

The fiduciary of a user may request a custodian to terminate the user's account. A request for termination must be in writing, in either physical or electronic form, and accompanied by:

(1) If the user is deceased, a certified copy of the death certificate of the user;

(2) A certified copy of the letter of appointment of the representative or a small estate affidavit, court order, power of attorney, or trust giving the fiduciary authority over the account; and

(3) If requested by the custodian, a number, username, address, or other unique subscriber or account identifier assigned by the custodian to identify the user's account; evidence linking the account to the user; or a finding by the court that the user had a specific account with the custodian, identifiable by the information specified in this subdivision.