Tex. Government Code § 22.228

(a) The other justices of a court of appeals shall certify to the governor the following facts when they occur:

(1) a justice of the court of appeals is totally disabled to discharge any of the duties of his office because of physical or mental illness that probably is permanent, has remained in that condition continuously for at least one year, and probably will continue to be incapacitated by the illness for the balance of his term of office; or

(2) a justice of the court of appeals has been called or ordered into the active military service of the United States.

(b) On receipt of a certificate that a justice is disabled or on active military service, the governor shall investigate and verify the facts contained in the certificate. If the governor determines that the appointment of a special commissioner is necessary, he promptly shall appoint a special commissioner who has the qualifications of a member of a court of appeals to assist the court.

(c) A special commissioner may sit with the court, hear arguments on submitted cases, and write opinions on the cases if directed to do so by the court. When the opinion of a special commissioner is adopted by the court of appeals, it becomes the opinion of the court.

(d) A special commissioner appointed by the governor shall receive the same compensation as a regular justice of the courts of appeals.

(e) A special commissioner who is appointed because of the disability of a justice serves on the court until the recovery from the disability, the death, or the expiration of the term of the disabled justice, except that a special commissioner may not serve for more than two years under the same appointment. In the event of a recovery from the disability, a majority of the justices of the court of appeals shall certify to the governor that the disabled justice is recovered. The certificate of a majority of the justices is conclusive evidence of the recovery of the disabled justice.

(f) A special commissioner who is appointed because a justice is on active military service serves on the court until the discharge of the justice from the military service or the expiration of the term of the justice who is on military service, except that a special commissioner may not serve more than two years under the same appointment. When the active military service of a justice of a court of appeals is terminated, the other justices of the court shall certify the termination to the governor. The certificate of the other justices is conclusive evidence of the termination of the active military service.

(g) This section does not give the members of a court of appeals or the governor the power to remove or suspend from office a justice of a court of appeals or to interfere with a justice in his constitutional rights and powers.