Texas Government Code - GOV'T § 844.502. Extended Optional Group Term Life Coverage

(1) evidence that the retirement system considers satisfactory to establish that, as a result of illness or injury, the member was unable to engage in gainful employment throughout the period beginning with the date of the last required contribution and ending on the date of death;

(2) a statement from the subdivision, on a form approved by the board of trustees, that the member was on leave of absence under the Family and Medical Leave Act of 1993 (Pub. L. 103-3) throughout the period beginning with the date of the last required contribution and ending on the date of death;  or

(3) a statement from the subdivision, on a form approved by the board of trustees, that the member was on leave of absence under the Family and Medical Leave Act of 1993 (Pub. L. 103-3) during part of the period beginning with the date of the last required contribution and ending on the date of death, with evidence that the retirement system considers satisfactory to establish that, throughout the rest of the period, the member was unable to engage in gainful employment as a result of illness or injury.