A little more info at this earlier story, including a photo of Alton Nolen (note the different spelling). Apparently this Amish dude has a long rap sheet. http://m.koco.com/news/moore-police-respond-to-active-shooter-situation/28250834
That story doesn’t mention a beheading. Just says 2 women stabbed, one of them dead.
I never heard any of his music and this event could really blunt his career aspirations.