Suspect Allegedly Abducted Mollie Tibbetts While She Was Running

Authorities in Iowa have arrested a suspect in the slaying of Mollie Tibbetts, the 20-year-old University of Iowa student who went missing in late July, police announced at a news conference Tuesday.

Christhian Behena Rivera, 24, is charged with first-degree murder in Poweshiek County, Rick Rahn of the Iowa Division of Criminal Investigation said.

Authorities first approached Rivera on Monday, Rahn said.

More than four weeks after Tibbetts was reported missing, her remains were believed to have been found Tuesday morning, dumped in a corn field in Guernsey, Iowa, about 15 minutes by car from Brooklyn, Iowa, where Tibbetts was last seen alive, a police source told PEOPLE Tuesday.

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