Tracking Cold Cases SIOUX CITY COLD CASES Murder, she wrote: Tracking Sioux City’s unsolved murders By Jody Ewing May 20, 2004 On July 10, 1955, at approximately 9:30 p.m., Mary Davis put her 22-month-old daughter, Donna Sue, to bed in her crib after giving her a bath. Humid temps had reached the mid 90s that day, […]