The field was in rural Poweshiek County, which includes Tibbetts' hometown of Brooklyn, Iowa, the Iowa Division of Criminal Investigation said in a press release.
"I can't speak about the motive". She was reported missing after she was unresponsive to text messages from her boyfriend, Dalton Jack, and was a no-show at work.
President Donald Trump asked his audience at a rally Tuesday in Charleston, West Virginia, whether they had heard about the "illegal alien" from Mexico.
"You heard about today with the illegal alien coming in, very sadly, from Mexico and you saw what happened to that incredible, attractive young woman", Trump told the crowd in Charleston. "The immigration laws are such a disgrace". "We just spoke to the family and I told them they raised a great daughter".
"We get to know the family". "We were able to pull him in" and conducted an interview with Rivera, he added.
She blamed a "broken immigration system" and promised to "bring justice to Mollie's killer".
Bongino said that pointing to the illegal immigration problem is not "politicizing the issue" of her death. That move means the agency has probable cause to believe he is subject to deportation. Officials say he is an undocumented immigrant who has been in the United States illegally for four to five years. It's about a three-hour drive from the resort city of Acapulco. After review of the video by officials, it was determined that Tibbetts was running near the area of Boundary and Middle Streets when a dark-colored Chevy Malibu was in the same vicinity.
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Based on the interview with Rivera, clothing found at the scene and tentative identification from the medical examiner, authorities say the body they found is Tibbetts.
The affidavit says he carried Tibbetts' body to a cornfield and covered her with corn stalks.
From there, he "blocked his memory", which he told police "is what he does when he gets very upset". So far police are not revealing how Tibbetts was killed. Investigations determined the vehicle belonged to Rivera, and he was then questioned by law enforcement about the disappearance of Tibbetts on Tuesday.
Court records don't list an attorney for Rivera, who is jailed on a $1 million cash-only bond. If convicted, the charge carries a mandatory sentence of life in prison.
For 34 days, federal, state and local authorities had scoured Poweshiek County for Tibbetts, and sifted through electronic data from her Fitbit, cellphone and social media accounts for any clue about what happened to the woman who was last seen alive while going for an evening run.
Authorities, who had narrowed their search to a carwash, Tibbetts's boyfriend's home, a truck stop and two farms. Her boyfriend and his older brother, who live in the home together, have both been cleared in the disappearance.
Last week, on August 15, Vice President Mike Pence said he met with the family of Tibbetts, according to the Des Moines Register.