Illegal immigrant charged in death of Mollie Tibbetts

FILE - This undated file photo released by the Iowa Department of Criminal Investigation shows Mollie Tibbetts, a University of Iowa student who was reported missing from her hometown in the eastern Iowa city of Brooklyn on July 18, 2018. Greg Willey, the vice president of Crime Stoppers of Central Iowa, said a body found Tuesday, Aug. 21, 2018, is believed to be Tibbetts. No information has been released about where the body was found. (Iowa Department of Criminal Investigation via AP, File)

A man who has been living in the U.S. illegally has been charged in the death of Mollie Tibbetts.

24-year-old Cristhian Rivera is charged with first-degree murder. He is being held on on a federal immigration detainer.

Officials have yet to officially confirm that the body was found is Tibbetts, but they believe it is her.

Officials say Rivera was seen on surveillance video following Tibbetts. He is cooperating with authorities. He told authorities he followed Tibbetts on her run to the point that Tibbetts threatened to call police. She then began to run. River told authorities he "blacked out" and came to in the corn field where Tibbetts was found. Rivera led authorities to Tibbetts in the corn field. Authorities say she was covered with corn stalks when he took them to her.

Rivera is believed to have been living in the area for 4-7 years.

Tibbetts had been missing since July 18, when she went out for a run in Brooklyn.

To read Rivera's arrest warrant, click below.

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