Police credit a 15-year-old girl, whose entire family was killed Wednesday in a Houston suburb, with saving lives after she played dead and called police on her uncle before he could go after more of her relatives, NBC News reported. Cassidy Stay, who was shot in the head and remains in critical condition, told police the gunman was 33-year-old Ron Lee Haskell, who broke into his former sister-in-law's home looking for his ex-wife. When he couldn't find her, police say Haskell tied up Cassidy and her family — two boys, 13 and 4; two girls, 9 and 7; and their parents, a 39-year-old man and a 33-year-old woman — and shot them each in the head, NBC affiliate KPRC reported. Haskell, who is believed to have committed the massacre following a domestic dispute, is charged with capital murder. Court papers show that he bound his mother with duct tape and then choked and threatened to kill her a week before the shootings.