CBS-affiliate KFSM is reporting Amber Drain, 22, has been charged with capitol murder in the death of her boyfriend's son, Dominic Doss.
Doss was found unconscious on July 18. Investigators say the baby died from massive head injuries. Drain told police she slapped Doss across the face because he wouldn't stop crying in the early morning hours; she then grabbed the baby by the ankles and slammed his head into the bedroom floor.
She told police she tried to go to the neighbors for help but no one was home, so she went back to bed. Doss was found hours later by his sister. He was pronounced dead at the hospital.
Drain is being held at the Washington County Jail.