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GRAPHIC: Witnesses testify about ‘horrific’ attack in Moore beheading trial

NORMAN, Okla. -- Six witnesses took the stand Friday on the second day into the trial of a man accused of beheading a coworker nearly three years ago.

Alton Nolen stands accused of stabbing 54-year-old Colleen Hufford multiple times and beheading her inside the Vaughan Foods distribution center on September 25, 2014.

After attacking Hufford, Nolen allegedly stabbed 43-year-old Traci Johnson numerous times before he was shot by Mark Vaughan, the former CEO of the company and a reserve sheriff's deputy.

Colleen Hufford: Courtesy of Facebook, Hufford family

Hufford died from her injuries, but Johnson survived.

On Friday, Nolen sat in court in a similar demeanor as he did during jury selections and opening statements. With both eyes shut and ears covered, Nolen was surrounded by deputies for the entire duration.

It was an emotional day for some witnesses as they recalled the moment Hufford was attacked.

The first witness called to the stand was an employee of Vaughan Foods, now Fresh Creative Foods, and an eyewitness to the incident.

The employee testified that Hufford went into his office that day regarding a work order problem when Nolen allegedly came up behind her, pulling her forehead back and exposing her neck before bringing a knife across her throat. He says Nolen then pushed her body into the hallway before proceeding to cut her throat "as deeply and as violently as he could."

He described the incident as "horrific" and "something you shouldn't have to see."

The cross examination, conducted by defense attorney Mitch Solomon, was relatively short. The witness was mainly questioned on the moments Nolen allegedly came at him with a knife, noting he held up a chair to create a barrier. He also told the court Nolen was distracted at some point and turned the corner.

Another witness testified she had an encounter with Nolen, who once called her 'rude'. She told the court she and Hufford had similar features and would sometimes be mistaken for each other, adding it would be difficult to tell them apart from the back. She left work early the day of the beheading.

During opening statements Thursday, the defense said there was no doubt Nolen killed Hufford; however, the main question for debate is 'why,' with the defense claiming he is mentally ill and didn't understand what he was doing was wrong.