Tibbetts, a 20-year-old rising sophomore at the University of Iowa, disappeared the evening of July 18 while jogging in the rural farming town of Brooklyn, a close-knit community of about 1,500 residents.
Rivera worked for four years at Yarrabee Farms where he gave his employers a state-issued photo ID and a social security card but in a different name, according to Dane Lang of Yarrabee Farms.
A first-degree murder charge was filed against 24-year-old Cristhian Rivera, an undocumented immigrant, sparking a renewed debate over immigration status.