A charge of Murder in the First Degree has been filed against a Fort Smith woman in the death of her stepson.Rae Von Elizabeth Smith was arrested in the death of her stepson, Messiah Hobby, on January 11, 2019. Messiah was brought to Mercy Hospital that morning after he was already dead, according to an affidavit of probable cause filed by Sebastian County Prosecuting Attorney Daniel Shue.Smith told police Messiah had fallen down the stairs twice, and she had attempted to treat him herself.Smith was initially booked in on a charge of Endangering the Welfare of a Minor. Her charge was upgraded to Murder in the First Degree on January 15, 2019.The charge requires that "there must be proof beyond a reasonable doubt that a Defendant knowingly caused the death of the victim, who was less than fourteen years of age," Daniel Shue, Prosecuting Attorney, wrote in a press release."In turn, "knowingly" is defined such that "a person acts knowingly with respect to the person's conduct or the attendant circumstances exist; or a result of the person's conduct when he or she is aware that it is practically certain that his or her conduct will cause the result," Shue wrote.Police were called to Mercy Hospital Friday after a 5-year-old boy was brought to the hospital after he was already dead, according to the affidavit.When officers arrived at the hospital, they met with a doctor who said the boy had "multiple bruises, abrasions and burns that were not consistent with statements provided by his caregiver, Rae Von Elizabeth Smith," according to the affidavit.An officer interviewed Smith, who said the boy had fallen down a flight of stairs Wednesday morning and that he suffered cuts and carpet burns. Smith said she didn't have insurance. She said she treated the injuries with a shower and then cleaned them with alcohol and applied Neosporin and bandages.Smith said the boy then fell down the stairs a second time on Thursday. She didn't notice any new injuries, but that his eye was bothering him.Smith said the boy didn't eat for the rest of the day, and that he fell asleep at 4 p.m. She laid down with him at 6 p.m., and when she woke up at 1 a.m. she found the boy wasn't breathing.She told police she started CPR, called her brother and called 911."Ms. Smith denied any medical treatment for two days after two consistent falls, saying she treated the wounds herself, and they did not have insurance," the affidavit said.Smith knew that on Thursday the boy "looked really bad, but still did not seek medical attention," the affidavit read.