A 13-year-old girl in Mississippi has died after allegedly being shot by her nine-year-old brother over a video game, police say.\r\nThey said the boy grabbed a gun on Saturday afternoon after his sister would not give up the controller.\r\nHe allegedly shot her from behind, and the bullet entered her brain.\r\nA local sheriff announced on Sunday that the teen had died of her injuries in a Memphis hospital. It was unclear how the boy obtained the gun.\r\nIt is also unclear what consequences the nine-year-old will face.\r\n"He's just nine," Monroe County Sheriff Cecil Cantrell told the Clarion Ledger.\r\n"I assume he's seen this on video games or TV. I don't know if he knew exactly what this would do. I can't answer that. I do know it's a tragedy."\r\nThe children's mother was in another room, feeding other children lunch at the time of the incident.\r\nPolice are still investigating the circumstances of the shooting, including how the weapon - a .25 calibre handgun - was accessed.\r\n"This is all new ground for us, we've never dealt with a kid shooting a kid at age nine," Sheriff Cantrell told local press.