A 23-year-old man has pleaded guilty to kidnapping and killing a Utah train worker in Wyoming.

Dereck James Harrison entered his plea during his arraignment in Lincoln County District Court in Kemmerer on Monday.

Harrison pleaded guilty to first-degree murder while perpetrating a kidnapping and kidnapping in the May slaying of 63-year-old Kay Porter Ricks.

He could face the death penalty.

The charges against Harrison include first-degree murder with premeditation and malice and first-degree murder while perpetrating a kidnapping.

Harrison was sentenced to at least 30 years in a Utah prison last year after pleading guilty to tying up a woman and her four daughters in a basement.

Prosecutors say after that, he and his father snatched and killed a train worker while on the run from police.

His father, Flint Harrison, killed himself in jail.