Horrible.
The policeman didn’t see any weapon, because there was no weapon.
The poor woman was inside her own home.
And even if he did see a weapon, that isn't a reason to shoot somebody. If you come upon somebody, particularly somebody in their own home, who happens to have a firearm that isn't a reason to shoot them. It may be a tense situation for a police officer, since from the point of view of the homeowner they may not know what is going on, and the police officer has to deal with another armed person, but the police officer should be an expert in that kind of situation.
After all they expect non-police officers to be able to determine when it is, or isn't necessary to use deadly force in far more complex situations.
The police claim they found a weapon "in the bedroom", which is where the victim was shot, but did not say if the victim was holding it when she was shot. I can't guess whether the gun was hers, or a "throw down" gun placed by police. If I were her, and saw two guys creeping around my backyard with flashlights, I would certainly grab a gun.
There is no excuse for this. The officer should be tried for the killing, and the senior officer on the scene should be fired for his horrible judgement. It was a simple case of knocking on the door and announcing yourselves as Fort Worth Police Officers.
Tragic!!!
You left out: The cop shot into an occupied house.
The old tried and true “I was in fear of my life” is not going to cut it for him.