what mental disorder was he diagnosed with?
Paranoid schizophrenia and manic depression.
Mark David Chapman
. All six defense experts concluded that Chapman was psychotic; five diagnosed paranoid schizophrenia, while the sixth felt that his symptoms were more consistent with manic depression. 
information about the song imagine by john lennon Lennon said that much of the song's lyrics and content came from his wife Yoko Ono. who wrote the lyrics of this track? John Lennon and Yoko Ono. what do these lyrics specify? Its lyrics encourage listeners to imagine a world at peace without the barriers of borders or the divisions of religion and nationality and to consider the possibility that the whole of humanity would live unattached to material possessions. what musical instruments are played in the background? Piano, bass guitar, drums, etc. in what musical key is the track composed? UNANSWERABLE on which chart did this track feature amongst the top 10? UK Singles Chart. what was the feedback received from the critics after listening to this track? It was positive feedback and reviews. from which album does this song belong? An album of the same name. what are the other tracks from this album? "It's So Hard" and "I Don't Want to Be a Soldier", to name a few. when was this album released? 9 September 1971 in the United States and on 8 October in the UK. which band was the singer of this album associated with before he went solo? The Beatles. what was his role in this band? Co-lead vocalist, and rhythm guitarist. when was this singer murdered? 8 December 1980. who killed him? Chapman. where did the murder scene take place? At their Manhattan apartment. what was the punishment received for this person's crime? A prison term of 20 years to life with a stipulation that mental health treatment would be provided.
wiki:19867398
Mark David Chapman [SEP] Mental state assessment
More than a dozen psychologists and psychiatrists interviewed Chapman in the six months prior to his trial—three for the prosecution, six for the defense, and several more on behalf of the court—and they conducted a battery of standard diagnostic procedures and more than 200 hours of clinical interviews. All six defense experts concluded that Chapman was psychotic; five diagnosed paranoid schizophrenia, while the sixth felt that his symptoms were more consistent with manic depression. The three prosecution experts declared that his delusions fell short of psychosis and instead diagnosed various personality disorders. The court-appointed experts concurred with the prosecution's examiners that he was delusional yet competent to stand trial.