I'm not very good with the search for individuals. The first objective for you is to determine if he was in the 19th Texas infantry or the 19th Texas cavalry.

Look here for a muster roll of the 19th Texas Infantry:

http://www.angelfire.com/tx/RandysTexas/19thInfMust.html

And you can also search here to try and find your man:

Civil War Soldiers and Sailors System
SOLDIERS · SAILORS · REGIMENTS · PRISONERS · CEMETERIES ...
www.itd.nps.gov/cwss/soldiers.cfm