Autopsy finds Iowa student killed by 'sharp force injuries'

BROOKLYN, Iowa -- The Iowa college student who was allegedly abducted by a stranger while running last month in a small Iowa town was killed by "multiple sharp force injuries," investigators announced Thursday. Preliminary autopsy results from the state medical examiner's office also determined 20-year-old Mollie Tibbetts was the victim of a homicide, the Division of Criminal Investigation announced in a press release.

The agency did not release additional details about the injuries Tibbetts suffered or what caused them, but said further examination of her body may result in additional findings. Autopsy reports are confidential under Iowa law, except for the cause and manner of death.

The man charged with first-degree murder in Tibbetts' death, Cristhian Bahena Rivera, allegedly led investigators to her body early Tuesday in a cornfield outside of Brooklyn, Iowa, the town where she was last seen last month. While investigators were confident then the body was that of Tibbetts, the autopsy definitively confirmed her identity.

Prosecutors allege Rivera abducted Tibbetts while she was out for an evening run in Brooklyn on July 18, killed her and disposed of her body in the secluded location.

A criminal complaint alleges Rivera confessed during a lengthy interrogation that began Monday to following Tibbetts in his car, getting out on foot and chasing after her. Rivera told investigators he panicked after Tibbetts threatened to call police on her cell phone, he blacked out and later came to when he was unloading her bloody body from the trunk of a car, it says.

Rivera worked for the last four years at a dairy farm a few miles from where Tibbetts was last seen. He and Tibbetts have no known connections, other than Rivera allegedly told investigators he saw her running previously. Investigators zeroed in on him as the suspect after obtaining footage from surveillance cameras showing a vehicle connected to him circling the area of Tibbetts' running route.

Earlier this week, investigators said they were uncertain how Tibbetts was killed or whether she was sexually assaulted. They've made no mention of recovering a weapon linked to the death.

Rivera, a native of Mexico who is suspected of being in the U.S. illegally, made his initial court appearance Wednesday and is being jailed on a $5 million cash-only bond. He faces life in prison without the possibility of parole if convicted.

Within hours of the arrest, President Donald Trump seized on the news Rivera was allegedly in the country illegally and called for stricter immigration laws. And in an interview Thursday on "Fox & Friends," Trump said Tibbetts was a "beautiful young girl" killed by a "horrible person that came in from Mexico, illegally here."

Trump has claimed people living in the U.S. illegally often commit crimes, but studies by social scientists and the libertarian Cato Institute reject that assertion. The studies show states with higher shares of people living in the country illegally have lower violent crime rates.

The president also said the suspect was "found by" agents from Immigrations and Customs Enforcement, an agency some liberals have called for abolishing because of tactics they view as overly harsh. An ICE spokesman said Thursday its agents worked with state and local investigators in "identifying, locating and interviewing the suspect."

Division of Criminal Investigation spokesman Mitch Mortvedt agreed ICE played a "significant role" in the case, particularly in helping confirm Rivera's identity and immigration status.

Rivera's defense attorney, Allan Richards, has denounced Trump for prejudging his client's guilt, saying the president's comments would make it hard for Rivera to get a fair trial.

"Let's let the process go," he said Thursday. "The process is about truth-finding in a rational, peaceful and efficient manner. We're only at the very preliminary stages."