In Texas you have to serve 50% of your time before you become eligilble for parole when you have an aggravated charge. The only chance that he has to get out before the 15 years is up is if he makes his parole when he comes up in 9. But the 9 years is mandatory to serve.
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~WE ARE GONNA MAKE IT THROUGH THIS... TOGETHER & ONE DAY AT A TIME~
For sexual misconduct, Texas has passed a law that can pull him right back for an indeterminate time, even beyond his mandatory release date, if he is deemed a threat to society.