HARRIS COUNTY, Texas -- A 4-year-old girl died after she was accidentally shot by her 3-year-old sister in a Houston-area home, officials say. The adults believed at least one of them was watching the girls, when they were in fact unsupervised in a bedroom, according to Sheriff Ed GonzalezSomehow the 3-year-old got a hold of a loaded semi-automatic pistol and accidentally shot her 4-year-old sister. It's got to be more than just to tell the kids not to touch the weapons," Gonzalez said