FILE - In this Jan. 8, 2016 file photo, Alton Nolen is led from the courtroom following his preliminary hearing in Norman, Okla. Nolen is accused of beheading a co-worker with a large butcher knife at an Oklahoma food processing plant. The trial for Nolen continues with a psychologist for the state saying he believes Nolen is competent. A psychologist for the defense said she believes Nolen is incompetent, and may suffer from schizophrenia. (AP Photo/Sue Ogrocki)
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