Farmhand pleads not guilty to first-degree murder in Mollie Tibbetts' death
The farmhand charged in the abduction and stabbing death of 20-year-old Mollie Tibbetts in Iowa has pleaded not guilty to first-degree murder. Cristhian Bahena Rivera is charged in the killing of Tibbetts, a University of Iowa student who disappeared while out for a run July 18 in Brooklyn, Iowa.