Mollie Tibbetts' convicted killer, Cristhian Bahena Rivera, is set to be sentenced Monday.

Judge delays sentencing for Mollie Tibbetts killer after bombshell claim by defense

With his sentencing hearing just days away, Cristhian Bahena Rivera, the man convicted of murdering Mollie Tibbetts is asking for a new trial.

Jury foreman Robert "Bo" Reed described handing down the guilty verdict in the Mollie Tibbetts murder trial as very emotional.

Guilty verdict in murder of Iowa student Mollie Tibbetts.

Chad Daybell, stepfather of Idaho kids found dead on his property, pleads not guilty

Cristhian Rivera was arrested 1 month after Mollie Tibbetts vanished in Iowa.

Rob Tibbetts, in a Des Moines Register op-ed, defends the Hispanic community.

The suspect charged with her murder is an undocumented immigrant, police said.

Friends and loved ones attend Mollie Tibbetts' funeral in Iowa.

Mollie Tibbetts, 20, vanished on a jog in July. Her body was found Tuesday.

Mollie Tibbetts, who vanished while on a jog last month, was found dead Tuesday.

Yarrabee Farms is owned by Craig Lang, a Republican fundraiser.

A first-degree murder charge was filed on Tuesday against a young man in the case of missing Iowa jogger Mollie Tibbetts.

Mollie Tibbetts, 20, vanished while on a jog in Brooklyn, Iowa, on July 18.

Mollie Tibbetts, 20, vanished while on a jog in Brooklyn, Iowa, on July 18.

Devin Riley believes he may have been "the last person to see her."

The reward for information in the case of missing Iowa college student Mollie Tibbetts has reached a new high.

The video was taken the day before the 20-year-old vanished while out jogging.

Rob Tibbetts said almost 500 new leads and tips have been generated.

The reward for information about missing Iowa college student Mollie Tibbetts is now $277,178, breaking a record in that part of the state.

ABC News has put together a timeline of what is known so far about the days leading up to and following the disappearance of 20-year-old Mollie Tibbetts.

It's been more than two weeks since Dalton Jack last saw or heard from his girlfriend, 20-year-old Mollie Tibbetts, before she mysteriously vanished in a rural Iowa town.

Mollie Tibbetts disappeared two weeks ago.

There has been an unconfirmed sighting of missing Iowa jogger Mollie Tibbetts in Kearney, Missouri.

Mollie Tibbetts, 20, disappeared on July 18.

Police have been working around the clock to locate a missing college student.

It's been 10 days since 20-year-old Mollie Tibbetts mysteriously vanished in a rural Iowa town, but investigators say they haven't given up hope that she's still alive.

The mother of Mollie Tibbetts told ABC News giving up hope is "not an option."

Investigators in Iowa have zeroed in on missing jogger Mollie Tibbetts' digital footprint, including her Fitbit, as they work to solve her mysterious disappearance.

It's been one week since 20-year-old Mollie Tibbetts mysteriously vanished in her rural Iowa town.

Mollie Tibbetts, 20, went missing on Wednesday in Brooklyn, Iowa.

The 20-year-old has not been seen since Wednesday night.