A 12-year-old Oklahoma girl stabbed her 9-year-old brother to death earlier this year and sobs hysterically that she doesn’t know why in body camera footage recorded by responding police officers.

Tulsa Police said the incident took place just before midnight on January 5 in an apartment where the siblings lived with their mother, Law and Crime reported.

Warning: The footage will be difficult to watch for some viewers.

The footage, obtained last week by Law and Crime, begins with the girl coming down the stairs inside the apartment to meet an officer, crying out “I’m so sorry” repeatedly.

Her mother, April Lyda, appears briefly before the officer leads the daughter away. Lyda appears again near the end of the video, when an officer meets with her to take her statement at the hospital where her son was rushed into surgery. Sadly, the boy succumbed to his injuries at about 2:30 a.m.

For nearly the entirety of the video, the 12-year-old is sobbing, apologizing, insisting she doesn’t know why she did it or what happened. Her mother explains to officers that she had told the boy he could sleep downstairs that night and that she later heard his screams and thought he was having a nightmare until she saw the blood.

Her daughter, she said, ran outside but apparently returned to the apartment before police arrived. Officers continue to talk with her while an ambulance rushes to the hospital with the 9-year-old and his mother.

The girl is convinced she’s going to jail for the rest of her life.

“I ruined my life,” the girl says when she’s placed in a patrol vehicle. “I ruined my whole future.”

The officer explains that Oklahoma law prevents a 12-year-old from going to jail and that juvenile detention is very different. The girl frets that her family will never trust her again.

She prays.  “I’m so sorry, God, please help me. What the f***. Please. F***** please.”

While speaking with the officer in the hospital, April Lyda says she doesn’t understand what happened, that her daughter has never been “aggressive” toward her son.

It’s not clear if any charges have been filed. According to an update from Lyda on a GoFundMe page, the daughter is heading into treatment and she hopes they will eventually be able to live together again..

For the latest true crime and justice news, subscribe to the ‘Crime Stories with Nancy Grace’ podcast.

[Featured image: Tulsa Police Department via Law and Crime]