Police said Cristhian Rivera is an undocumented immigrant and has lived in the Poweshiek County, Iowa, area for about four to seven years. He is originally from Mexico, but police did not say when he moved to the United States, according to The Associated Press. Rivera has been working in the area, but details about where he worked have also not been released. Rivera is originally from Guayabillo, Guerrero, Mexico. He studied at Preparatoria 35 in Guerrero, according to his Facebook page. Rivera’s ex-girlfriend, who also lives in Iowa, is Facebook friends with Mollie Tibbetts. According to his Facebook page....