This sounds like a really complex and puzzling situation. Surely in the case you're referring to, there have been legal charges and cases involved ? When you say he HAS murdered someone, do you suspect this, or has he said that this has happened, or has he been charged or convicted of murder ? Some people are primarily evil, and don't necessarily suffer from a formal mental disorder which can be diagnosed and treated and cured or greatly improved by treatment : maybe that's what the doctors you refer to, meant ?
Sometimes such a person chooses to fake some aspects of a mental illness, hoping to get an advantage in a court case. They might claim to be hearing voices, or describe paranoid ideas, hoping to be found by the court to be suffering from an illness they actually don't have, to avoid jail, and be sent instead to a mental hospital, where they can pretend to get cured.
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