To me, this makes it pretty clear that deadly force to prevent a theft or criminal mischief is only legal at night, which is defined in Texas law as 30 minutes after sunset to 30 minutes before sunrise.§ 9.42. DEADLY FORCE TO PROTECT PROPERTY. A person is
justified in using deadly force against another to protect land or
tangible, movable property:
(1) if he would be justified in using force against the
other under Section 9.41; and
(2) when and to the degree he reasonably believes the
deadly force is immediately necessary:
(A) to prevent the other's imminent commission of
arson, burglary, robbery, aggravated robbery, theft during the nighttime, or criminal mischief during the nighttime; or
(B) to prevent the other who is fleeing
immediately after committing burglary, robbery, aggravated
robbery, or theft during the nighttime from escaping with the
property; and
(3) he reasonably believes that:
(A) the land or property cannot be protected or
recovered by any other means; or
(B) the use of force other than deadly force to
protect or recover the land or property would expose the actor or
another to a substantial risk of death or serious bodily injury.
So the answer to the OP's original question is "Yes, but only at night".
If this has, in fact, been mentioned in this thread then I missed it and I apologize.