DAVENPORT, Iowa—A prosecutor warned prospective jurors Monday that the trial of a Mexican national charged in the 2018 fatal stabbing of a University of Iowa student will include graphic evidence that will be emotionally difficult to see and hear. Prosecutor Scott Brown said the first-degree murder trial of Cristhian Bahena Rivera in the death of 20-year-old Mollie Tibbetts will feature testimony about the stab wounds she suffered after going for a run. “We’re going to talk about the violent death of a young girl, Mollie Tibbetts,” he said. “It’s not going to be pleasant.” Brown spoke during jury selection at an events center in Davenport, where lawyers began working to whittle down a 175-person pool to 12 jurors and three alternates. Jury selection is expected to continue Tuesday before a two-week trial at the Scott County Courthouse. Legal experts say ensuring a fair trial for Rivera, a farm laborer who …