I hate to say this, but...I think the homeowner could be prosecuted on this one. Texas law allows deadly force to protect property, or to prevent the BG from escaping with the property, but this shooting doesn't seem to me to fall under that.
Here's the Texas law as written...
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.
I think this homeowner may have shot off his mouth a bit too much. He shot the man, not to protect his property, but to prevent him from escaping without his property. Having said this, a grand jury may no-bill anyway. How could any of us react perfectly under such a stressful moment?
I think the homeowner really made a mistake by gloating about what he did. Wrong attitude to have, IMHO.
mistergus75