PHOTOS: Alton Alexander Nolen, Oklahoma Beheading Suspect

Alton Alexander Nolen, 30, is the suspect who allegedly beheaded a woman in the September 25 workplace attack at Vaughan Foods in Moore, Oklahoma. He had just been fired, and allegedly attacked the first person he saw upon entering the food distribution plant. Police say he was shot by the company's COO, Mark Vaughan, as the suspect took his knife to a second victim, who survived. Co-workers say he had recently tried to convert them to Islam. This comes as the American public has been warned of so-called "lone wolf attacks" on the homeland by sympathizers of ISIS, which is being targeted by U.S. airstrikes in Iraq and Syria. Click through to see various mugshot images of Nolen.