A 12-year-old girl has been taken into custody by police in Tulsa, Oklahoma, after cops say she fatally stabbed her little brother while their parents slept upstairs. First responders arrived at the apartment and began performing CPR on the boy, 9, before rushing him to the hospital for emergency surgery. Cops say the boy died at the hospital around 2:30 a.m. Friday. The names of the children and their parents were not released by police. The older sister is being held at a juvenile justice center in Tulsa.