A Kansas City woman accused of decapitating her 6-year-old son has been found mentally unfit to stand trial. The Kansas City Star reports that a judge last week placed 35-year-old Tasha Haefs in the custody of the Missouri Department of Mental Health after finding her incompetent to stand trial. Haefs had been charged with first-degree murder in the killing of Karvel Stevens. Officers in February found the boy and a family dog decapitated. Police went to the home after a woman believed to be Haefs called and said the devil was trying to attack her. Haefs’ family members say she had struggled for years with drug addiction, depression, severe trauma and hallucinations. A message seeking comment was left Wednesday for Haefs’ public defender.