No. Shooting someone in the back because he stole from another may be frowned upon in Delaware, but not here.
The Texas Penal Code goes on in Section 9.43 PROTECTION OF THIRD PERSON'S PROPERTY with the same requirements and options for protection as for one's own property. Specifically, deadly force is not disallowed to prevent the commission of a burglary, arson, robbery, theft during the nighttime or criminal mischief during the nighttime or to prevent the escape of someone who has just committed such an act.
What's a "warning shot"?