The Okmulgee County Sheriff's Office says one of the three teens who were shot by their mother is brain dead.
Kayson Toliver, 18, was pronounced dead after his mother Amy Hall shot him in the head while he was in bed, according to court documents.
Hall also shot Kayson's 16-year-old sister, Kloee Toliver, in the head. Doctors have declared her brain dead.
Kloee will remain on life support for the time being since she is an organ donor. After the donation, she will be taken off life support.
Amy Hall will be facing an additional charge of first degree murder.
The third child, age 14, remains in stable condition in the hospital.