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Thornton man who killed girlfriend, drove her body to Wyoming pleads guilty

Jonathan Akin walked into a police station and told officers his girlfriend's body was in the trunk of his car.

A 23-year-old man has pleaded guilty to second-degree murder for stabbing his girlfriend to death in a Thornton apartment and then driving her body across state lines, the 17th Judicial District Attorney announced Wednesday.

Jonathan Akin in November 2018 walked into a Powell, Wyoming police station and told officers there he had the body of his girlfriend, 21-year-old Autumn Rivera, in the trunk of his vehicle, the DA said.

Officers found Rivera's body wrapped in a blanket in the trunk.

Akin faces 25-40 years in prison and will be sentenced on April 28.

RELATED: Thornton man accused of killing girlfriend, driving body to Wyoming to face murder charge in Colo.

According to an arrest affidavit, Akin and Rivera had gone out clubbing. They took an Uber home early the next morning, and Rivera texted her sister that she and Akin were fighting about their relationship, the affidavit says.

The affidavit says Akin claims he was cutting up fruit to help with his hangover while Rivera was in the shower. He said Rivera was yelling at him. According to the affidavit, Akin said he blacked out, and when he woke back up Rivera was dead.

Akin then drove over to his mother's house, according to the affidavit, and spent the night there. The next morning, Nov. 26, he told his mother he had killed Rivera but didn't know what had happened.

According to the affidavit, Akin put Rivera's body in the trunk of his car and drove to Wyoming.

On the morning of Nov. 27, Rivera's sister attempted to contact Akin, the affidavit says, because she had not heard from Rivera and she knew Rivera had missed work. According to the affidavit, Rivera's sister said Akin called her back that morning and admitted that he had killed Rivera and was going to turn himself in.

Akin then turned himself in to police in Powell, Wyoming on Nov. 27, and he was subsequently extradited back to Colorado.

RELATED: Thornton man accused of killing girlfriend, driving body to Wyoming contests extradition

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