jailhouse nut

"A diagnosed schizophrenic, who thought he was Elvis Presley, Mr. O'Connor had undergone two psychological evaluations to see if he was mentally fit to stand trial."
QuadCities Online : how can Elvis put me away
this is a very long story - the highlights...
"In the evaluation interviews, with his collar turned stiffly against his neck, Mr. O'Connor introduced himself as Elvis Presley, the King of Rock and Roll and listed the real Elvis Presley’s military history, education and family info as his own....Elvis said he killed Hot Rod because he was going to steal my limelight and fame....He would get up and sing Elvis songs during police interviews...He has heard that Elvis will jump on picnic tables in the prison yard, sing and play an imaginary guitar to Elvis tunes."