[Aguila Blanca]

Texas Penal Code, Title 2, Chapter 9, Subchapter A:

Sec. 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.

Acts 1973, 63rd Leg., p. 883, ch. 399, Sec. 1, eff. Jan. 1, 1974. Amended by Acts 1993, 73rd Leg., ch. 900, Sec. 1.01, eff. Sept. 1, 1994.


Sec. 9.43. PROTECTION OF THIRD PERSON'S PROPERTY. A person is justified in using force or deadly force against another to protect land or tangible, movable property of a third person if, under the circumstances as he reasonably believes them to be, the actor would be justified under Section 9.41 or 9.42 in using force or deadly force to protect his own land or property and:

(1) the actor reasonably believes the unlawful interference constitutes attempted or consummated theft of or criminal mischief to the tangible, movable property; or

(2) the actor reasonably believes that:

(A) the third person has requested his protection of the land or property;

(B) he has a legal duty to protect the third person's land or property; or

(C) the third person whose land or property he uses force or deadly force to protect is the actor's spouse, parent, or child, resides with the actor, or is under the actor's care.

Acts 1973, 63rd Leg., p. 883, ch. 399, Sec. 1, eff. Jan. 1, 1974. Amended by Acts 1993, 73rd Leg., ch. 900, Sec. 1.01, eff. Sept. 1, 1994.

The OP is asking about Texas. Under Texas law it appears that it IS lawful to use deadly force to stop a robbery or burglary ... even if you are not the owner of the property.

So it seems all that is up for discussion is whether you, personally, would shoot someone to stop a robbery, since the question of legality has been answered by the law.