KANSAS CITY, Mo.—A Kansas City woman charged with decapitating her 6-year-old son will undergo a mental health evaluation. The prosecution of Tasha Haefs, 35, was suspended Thursday after a court ordered the mental health evaluation, KSHB-TV reported. Haefs was charged with first-degree murder and armed criminal action after officers found her son, Karvel Stevens, dead on Tuesday. Police said officers went to the home after a woman called dispatchers and said the devil was trying to attack her. Officers saw blood and other evidence of a crime but the woman would not open the door, according to a probable cause statement. When police entered the home, they found the boy dead, bloody knives, and saw Haefs with blood on her, the affidavit said. A dog had also been killed. No other children were in the home. Haefs is being held without bond. During her arraignment on Thursday, the mental health …