News9.com

DEL CITY, Oklahoma -- The medical examiner released the autopsy reports for the three children who died in an R.V. fire in Del City.

One-year-old Kailey, three-year-old Crystal, and four-year-old Christopher all died from smoke inhalation and burns.

Court papers revealed investigators believe the mother of the three young was using methamphetamine at the time of the fire, and the kids may have died as a result of child neglect.

Their mother, 25-year-old Stephanie Dunham, told fire inspectors the fire started when a floor heater fell over. She said she tried to put the fire out but couldn't, so she told all three children to go to the back of the motor home and "stay there and not move."

Dunham said she left the motor home to get some water and when she returned, the fire was out of control. That's when she called the fire department. She was taken to the hospital with burns on her hands, face and arms.

Investigators said based on the evidence so far, felony acts of child neglect may have been committed. Both the Del City police and fire departments confirm their investigation is still ongoing and no charged have been filed.