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Tammy Zywicki (Courtesy Iowa City Press-Citizen) Tammy Jo Zywicki Homicide Tammy Jo Zywicki 21 YOA DOB: March 13, 1971 Grinnell, Iowa college student Poweshiek County Departed Evanston, Ill., Aug. 23, 1992, to return to Iowa Car broke down on I-80 near LaSalle, Illinois Body found September 1, 1992, in Lawrence County, Missouri Case Jurisdiction: Illinois […]