This Oct. 1, 2014, file photo provided by the Cleveland County, Okla., Sheriff's Department shows Alton Nolen, who has been charged in the Sept. 25, 2014, beheading death of his co-worker, Colleen Hufford, at a food processing plant in Moore, Okla. An Oklahoma judge will convene a non-jury trial scheduled to begin Monday, Oct. 26, 2015, to determine whether Nolen is mentally competent to be tried for first-degree murder.  (Cleveland County Sheriff's Department via AP, File)

Arraignment set for Oklahoma man in co-worker’s beheading

A man charged with beheading a co-worker with a butcher knife at an Oklahoma food processing plant is scheduled to formally enter a plea to …