Tex. Est. Code § 1203.106
If, after letters of guardianship have been issued, it is discovered that the decedent left a lawful will, the letters shall be revoked and proper letters shall be issued to a person entitled to the letters.
Added by Acts 2011, 82nd Leg., R.S., Ch. 823 (H.B. 2759), Sec. 1.02, eff. January 1, 2014.