Texas Estates Code - EST § 251.053. Exception for Foreign and Certain Other Wills

(1) the law of the state or foreign country where the will was executed, as that law existed at the time of the will's execution; or

(2) the law of the state or foreign country where the testator was domiciled or had a place of residence, as that law existed at the time of the will's execution or at the time of the testator's death.