Final Moments of Mollie Tibbetts Revealed by Illegal Immigrant Accused of Killing Her

This undated photo provided by the Iowa Department of Public Safety shows Cristhian Bahena Rivera. Authorities said on Tuesday, Aug. 21, 2018, that they have charged a man living in the U.S. illegally with murder in the death of Iowa college student, Mollie Tibbetts, who disappeared a month ago while jogging in a rural area. Iowa Division of Criminal Investigation Special Agent Rick Rahn said that Rivera, 24, was charged with murder in the death of Tibbetts. Iowa Department of Public Safety via AP

The final moments before the death of missing college student Mollie Tibbetts were revealed by an illegal immigrant accused of murdering her, investigators said.

Family members and investigators knew Tibbetts, 20, had been jogging on July 18 before she disappeared but data from her computer led them to believe she had returned to the home of her boyfriend, where she'd been dogsitting while he was away on a work trip, before she vanished.