I didn't find anything for him in Bexar County but I'm not surprized if he traveled around with the carnival.
Do you have his obituary? If not, I'd contact the following:
San Antonio Genealogical and Historical Society, http://txsaghs.org/cpage.php?pt=14
San Antonio Public Library, http://mysapl.org/Services/Collections/Texana#189122055-coll...
Where he was buried in Galveston might be in his obit.
Did you look for him in www.findagrave.com/
I did a Google search for the Cortez Funeral Home records but didn't find anything. You'd have to contact all of the local genealogical and historical Bexar County societies and ask each one.
Then you'd have to contact the state organizations too. They could have been given to anyone or thrown away. They are considered business records and most states don't have laws requiring their retention. Successful Searching!