What is his illness

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I was thinking schizophrenia and even multiple personality disorder- the later because when he is Shooter, he doesn't remember his true identity.

Schizophrenia for sure though. He showed a lot of the positive symptoms of it at the end (hallucinations- both verbal and auditory and delusions thinking he had to kill his wife..but the delusion part mixes in with multiple personality so that could be either one).

He definitely does not have schizophrenia. I'm actually writing a paper on Mort Rainey right now for my psych class and was planning on saying he had dissociative identity disorder, but then I saw this thread. Schizophrenia sounded a little off to me, so I asked my mom (who is a clinical psychologist), and she said it doesn't really fit him. She actually said that DID doesn't fit him perfectly either, since he starts to become aware of his other identity towards the end of the movie, but it's a better match than schizo.

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Schizophrenia, contrary to the popular belief (and the etymology) does not involve multpiple personalities. A person with schizophrenia has hallucinations, most of the time auditive, and sometimes visual (some people believe that Joan of Ark was a schizophrenic for example).

He suffers from hallucinations and multiple personality disorder. Not sure about schizophrenia.

he was schizophrenic but it was probably made worse by the circumstances he was dealing with in his life

It is simply that, in both movies and real life, he keeps marrying bisexuals.

It is more possible to be DID - Dissociative Identity Disorder, than Schizophrenia.