A Pennsylvania man suspected of killing his dad and displaying his decapitated head in a YouTube video has been arrested. Justin Mohn, 32, was taken into police custody Jan. 31 on suspicion of first-degree murder, abuse of a corpse and possession of an instrument of crime with intent in connection with the death of his father, Michael Mohn, 68, per NBC News. He was arraigned at 4 a.m. and is being held without bail.