A Mexican man charged with killing an Iowa college student worked on a dairy farm for years under a false name just a few miles from where the young woman was allegedly abducted while running last month, his employer said Wednesday. Cristhian Bahena Rivera was a good employee who showed up on time to take care of the cows and got along well with his co-workers, said Dane Lang, manager of Yarrabee Farms in Brooklyn, Iowa. The 24-year-old kept coming to work after Mollie Tibbetts disappeared July 18, and "nobody saw a difference" in his demeanor, Lang said. His colleagues were stunned Tuesday to learn that he was not only the suspect in Tibbetts' death, but that he had a different real name than what he went by on the farm, he said. "Our employee is not who he said he was," Lang said at a news conference at the farm. "This was shocking to us." When Rivera was hired in 2014, he presented an out-of-state government-issued photo identification an...