A nine-year-old boy shot and killed his 13-year-old sister after an argument over a video game controller, authorities said.
The boy grabbed a gun when the girl, Dijonae White, would not give up the video game controller when her brother wanted it on Saturday, Monroe County Sheriff Cecil Cantrell said.
He said the boy shot the teenager, a student at Tupelo Middle School in Mississippi, in the back of the head and that the bullet entered her brain.
She was rushed to a children's hospital in Memphis, Tennessee, where she later died, the Daily Mail reported.
Their mother was in another room at the home in Okolona feeding lunch to other children when it happened, Sheriff Cantrell told WTVA.
Authorities said they do not yet know how the firearm used in the shooting had been accessed.
The sheriff added that the circumstances of the shooting are still being investigated.
He added that he isn't sure what consequences the face will face.
"He's just nine. I assume he's seen this on video games or TV," Sheriff Cantrell told the Clarion Ledger.
"I don't know if he knew exactly what this would do. I can't answer that. I do know it's a tragedy."