Nation Iowa judge delays sentencing for Cristhian Bahena Rivera, convicted of Mollie Tibbetts’ 2018 murder July 15, 2021William Morris, Des Moines RegisterComments Off on Iowa judge delays sentencing for Cristhian Bahena Rivera, convicted of Mollie Tibbetts’ 2018 murder Cristhian Bahena Rivera was convicted in May of the first-degree murder of University of Iowa student Mollie Tibbetts in 2018.