18-year-old charged in decapitation of man in Chicago CHICAGO, Dec. 27 (UPI) -- An 18-year-old man has been charged in the decapitation of a man on Chicago's Northwest Side, officials said. The suspect, identified as Alexis Valdez, has been charged with first-degree murder in the death of Silvestre Diaz-Hernandez, 41, the Chicago Tribune reported. Police discovered Diaz-Hernandez' body about 2:05 a.m. Wednesday after receiving a report of a decapitated body being found in a basement apartment. The Cook County medical examiner's office Thursday ruled the death a homicide caused by multiple blunt and sharp force injuries. Valdez was arrested at the scene without resistance, police said. The relationship between the two men was unclear, police said.