A judge has ordered a mental competency exam for a man accused of beheading a co-worker at a food processing plant in Oklahoma.

The Oklahoman (http://bit.ly/18ZRutv ) reports that defense attorneys for Alton Alexander Nolen requested the evaluation. Cleveland County District Judge Lori Walkley approved their request, and her order was filed Wednesday.

Nolen is charged with first-degree murder in the Sept 25, 2014, death of Colleen Hufford. Nolen is accused of beheading Hufford and stabbing another woman at Vaughan Foods after he was suspended from his job at the plant.

Prosecutors have said they will seek the death penalty.

An expert from the state Mental Health and Substance Abuse Services Department will examine Nolen and will report findings to Walkley.

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Information from: The Oklahoman, http://www.newsok.com