Cold Cases in Chickasaw County, Iowa     Homicide Rhonda A. Knutson 22 YOA Phillips 66 Convenience Store U.S. Highway 63 New Hampton, IA Chickasaw County (Jurisdiction) DCI Case # 92-07040 September 7, 1992 Early on Monday, September 7, 1992, Rhonda Knutson, 22, was murdered while working the overnight shift at the Phillips 66 convenience […]