The latest on a preliminary hearing in the murder trial of an Oklahoma man accused of beheading a co-worker (all times local):

10:35 a.m.

An Oklahoma man has described watching his co-worker being beheaded to a judge who is deciding if there's sufficient evidence for the suspect in the grisly attack to stand trial for first-degree murder.

Alton Nolen is charged in the September 2014 death of Colleen Hufford, who was killed at a food processing plant in Moore. At a preliminary hearing Friday, Special Judge Steve Stice heard testimony from Gary Hazelrigg, who witnessed the attack.

Hazelrigg testified that he was speaking with Hufford when Nolen burst into his office carrying a large knife. Hazelrigg said Nolen immediately began attacking Hufford and didn't stop even when other employees tried to subdue him.

In October, a judge found Nolen mentally competent to stand trial. He has pleaded not guilty.

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7 a.m.

A judge in Oklahoma will decide whether a man accused of beheading a co-worker at a food processing plant will be tried on a first-degree murder charge.

A preliminary hearing is scheduled Friday for 31-year-old Alton Nolen.

Prosecutors are expected to present evidence about the September 2014 attack in which 54-year-old Colleen Hufford was killed and a second co-worker was injured at the Vaughan Foods plant in Moore.

Special Judge Steve Stice will decide whether there is probable cause that a crime was committed and that Nolen committed it. A not guilty plea has been entered on Nolen's behalf.

Investigators say Nolen had been suspended from his job when he walked into the company's administrative office and attacked Hufford with a large knife.