Tex. R. Civ. P. 623
As amended through August 27, 2024
When an executor, administrator, guardian or trustee of an express trust dies, or ceases to be such executor, administrator, guardian or trustee after judgment, execution shall issue on such judgment in the name of his successor, upon an affidavit of such death or termination being filed with the clerk of the court or the justice of the peace, as the case may be, together with the certificate of the appointment of such successor under the hand and seal of the clerk of the court wherein the appointment was made.
Tex. R. Civ. P. 623