Cold Cases in Sioux City, IA Homicide. Rev. George Haddock. ... Homicide. Thecla Gerken. 23 YOA. ... Homicide. Jimmy Bremmers. 8 YOA. ... Homicide. Donna Sue Davis. 21 months of age. ... Homicide. Hilda Fletcher. 53 YOA. ... Missing Person. Thomas Myles Dougherty. 45 YOA. ... Triple Homicide. Ernest William (Billy) Isom II, 27; ... Missing Person. Maurice Kneifl. More items...