Tex. Government Code § 401.081: SUCCESSION OF GOVERNOR-ELECT AND LIEUTENANT GOVERNOR-ELECT.

The speaker of the house of representatives and the president pro tem of the senate shall call a joint session of the house of representatives and the senate for the purpose of electing a governor and a lieutenant governor if:

(1) the governor-elect and the lieutenant governor-elect die or are permanently incapacitated to take their oaths of office at the time the legislature canvasses the election returns for governor and lieutenant governor; and

(2) the legislature finds that the governor-elect and the lieutenant governor-elect are not able to take the oath of office and to fulfill the duties of office.

Added by Acts 1993, 73rd Leg., ch. 268, Sec. 15, eff. Sept. 1, 1993.