Texas Government Code - GOV'T § 601.002. Performance of Duties by First Assistant or Chief Deputy

(a) The first assistant or chief deputy of a public office in which a physical vacancy occurs shall conduct the affairs of the office until a successor qualifies for the office.

(b) The authority of a first assistant or chief deputy to discharge the duties of an office under Subsection (a) ceases when the successor to the office qualifies for the office.

(c) If the vacancy occurs during a legislative session and the successor to the office is subject to senate confirmation, the authority of the first assistant or chief deputy to discharge the duties of an office under Subsection (a) ceases on the earlier of:

(d) This section does not apply to a vacancy on a board or commission.