Tex. Gov't Code § 824.103
(a) Benefits payable on the death of a member or annuitant, except an optional retirement annuity under Section 824.204(c)(1), (c)(2), or (c)(5), are payable, and rights to elect survivor benefits, if applicable, are available, to one of the classes of persons described in Subsection (b), if:
(b) The following classes of persons, in descending order of precedence, are eligible to receive benefits in a situation described in Subsection (a):
Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 34.103 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989.
Amended by Acts 1995, 74th Leg., ch. 555, Sec. 17, eff. Sept. 1, 1995.
Acts 2011, 82nd Leg., R.S., Ch. 455 (S.B. 1667), Sec. 10, eff. September 1, 2011.