Tex. Government Code § 854.304: STANDARD DISABILITY RETIREMENT ANNUITY.

(a) The standard disability retirement annuity payable under this subtitle is the sum of a member's prior service annuity and current service annuity.

(b) A prior service annuity is subject to reduction as provided by Section 855.308(f).

(c) A standard disability retirement annuity is payable throughout the life of a retiree. When a retiree who receives an annuity under this section dies, an additional benefit may be payable under Section 854.502.

Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Amended by Acts 1981, 67th Leg., 1st C.S., p. 226, ch. 18, Sec. 86, eff. Jan. 1, 1982. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 64.304 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989. Amended by Acts 1999, 76th Leg., ch. 83, Sec. 11, eff. Dec. 31, 1999; Acts 2001, 77th Leg., ch. 121, Sec. 21, eff. Jan. 1, 2002.