Three years after she was killed after going jogging, the murder trial in the death of 20-year-old student Mollie Tibbetts is finally underway. In 2018, Tibbetts' body was found in a cornfield after four weeks of searching. Her death by stabbing horrified the nation. The accused killer, farmworker Cristian Bahena Rivera, is an undocumented immigrant from Mexico. The defense tried to cast suspicion on Jack, who said he planned to ask Tibbetts to marry him.