Missing Iowa student found dead

After a nearly five-week search, authorities discovered the body of Mollie Tibbetts, who was allegedly murdered by an undocumented immigrant. ABC News' Lynda Lopez reports.
2:08 | 08/22/18

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Transcript for Missing Iowa student found dead
We turn out to the new information we're learning overnight in the murder of an Iowa college student Molly tidbits a thirties have now charged a Mexican immigrants in the United States illegally. With her murder. The farm where the suspect work has released a statement saying he did pass a background check. Meanwhile an autopsy will be done today on Molly's body with several questions still unanswered in this case. A tragic ends to a tireless search for a missing college student in Iowa. A body was discovered early this morning in a farm field southeast. A Brooklyn Iowa the identity has nothing confirmed however we believe it to be the body of Molly Travis. Authorities also announcing in addition to finding the body a suspect is now under arrest Christian Rivera a 24 year old man who police say it was in the US illegally and living in the same county where Molly tip it's disappeared. Rivera now in jail charged with first degree murder. Officials revealing that surveillance video provided detectives with images of a suspicious vehicle. They identified that vehicle belonged to mr. Rivera. Then we located him at interviewed him subsequently he led us to her location. It's nine year old University of Iowa student disappeared on July 18 last seen going for a run in Brooklyn Iowa when she did not show up for work the next day her coworkers got worried and her family reported her missing. According to police Rivera was brought in for questioning on Monday. I actually tells us that he ran alongside of her or behind her. And then at one point he tells us that Molly grab hold of her fall and instead you need to leave me alone I'm gonna call the police. And then she took off running being turned chased her down and then he tells us that at some point time he blacked out. The suspect worked at a local farm for four years. Yeah B farms has now released a statement saying Rivera was vetted through the government's. The farm says it keeps records on all employees and has shared them with authorities. And authorities are not yet commenting on the motive for Molly's mercker.

This transcript has been automatically generated and may not be 100% accurate.

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