Section 21.02 of the Texas Penal Code–Continuous Sexual Abuse of Young Child or Disabled Individual:
https://codes.findlaw.com/tx/penal-code/penal-sect-21-02
Under this statute there is no possibility of parole.
The press release:
A little more about Mr. Palmore:

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Well, I will say Texas got this right. Prior to 1974 they very likely would have electrocuted him.