Check if he is dead first. Contact the social security death records..
Check with the bureau of vital records in Texas. There may be a record of divorces.
If he is dead, get a copy of the death certificate from the bureau of vital records (or the funeral home.) The death certificate will show where he died and were he resided when he died.
To get a divorce in Texas, you have to reside in the county where you file for at least 6 months.
Each county should also have a department of vital records.
If the death certificate is not correct, contact the bureau of vital records about amending it.
