@maya54: Okay, I have spent a few more minutes in thought on the issue of whether the officer will be allowed to present a defense of acting in the role of an officer.
I think that the trial court judge will allow this defense because both are issues of fact & this is a jury trial (the jury is the fact finder).
I do not think that this defense is a matter of law (although I do believe that it would be reversible error to deny such defense to an officer in full uniform in transit from work).
Therefore, the jury will likely decide as issues of fact:
Whether the officer in full uniform in transit from work as a full time police officer was acting in the role of a police officer when confronting another in an apartment burglary.
And whether her belief that this was her apartment was reasonable.
And whether her stated belief that the deceased was a burglar in her apartment was reasonable.
And whether, in light of Texas’ castle law, her actions in pointing a gun at the deceased & pulling the trigger were reasonable under Texas law.
P.S. If the jury determines that the officer was acting in the role of a police officer at the time of the shooting, then the only issue left may be whether or not the act of shooting was legally allowed under Texas law.