MONTEZUMA, Iowa (AP) — Iowa official says suspect in custody in Mollie Tibbetts’ death being held on federal immigration detainer. 24-year old 24-year-old Cristhian Bahena Rivera was in the country illegally has been charged with 1st degree murder in the death of Iowa college student Mollie Tibbetts. If convicted, the charge carries a mandatory sentence of life in prison.

Investigators say they used surveillance video in tracking down Rivera. The video showed Tibbetts jogging in a rural area near her hometown of Brooklyn as well as Rivera’s car.

Police had searched the area but noted her body was found in a field, covered with corn stalks. Earlier Tuesday, investigators announced a body believed to be Tibbetts was found in rural Poweshiek County. Tibbetts, a 20-year-old student at the University of Iowa, has been missing since July 18.