Authorities say he also stabbed her other young son multiple times, but the boy survived and called police after regaining consciousness.
Defense lawyer claim the acts were committed while "Kiko" - Wilson's homicidal personality - controlled his behavior, so Wilson shouldn't be held responsible.
In rejecting that argument Friday, state Superior Court Judge Fred Theemling ruled Wilson's other personalities would be viewed at trial as aspects of himself, not as distinct individuals.
Both defense and prosecution experts determined Wilson suffers from dissociative identity disorder.
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