Rational and guilty- Rational and guilty is when an individual fully understands right from wrong and is guilty.
Guilty but insane- Guilty but insane is when the person is insane but is thought to know right from wrong in the situation so they are guilty.
Not guilty by reason of insanity- Not guilty by reason of insanity means the person cannot be guilty because they do not know right from wrong.
I would rule that he is Guilty but insane because he committed the murder, but also he suffers from schizophrenia. Schizophrenia is a mental illness that affects the person mind, emotions, behavior and also the person ability to think correctly. It is also depends on if he was taking his schizophrenia