The accused admitted killing his spouse but argued he acted in an automatistic dissociative state allegedly triggered by insulting words.
The Court clarified a general two-step framework for automatism, requiring the defence to establish a proper evidentiary foundation and then requiring the trial judge to determine whether the condition is mental disorder or non-mental disorder automatism by reference to internal cause, continuing danger, and policy factors.
The majority held that the alleged condition was properly treated as a disease of the mind and that only mental disorder automatism should have gone to the jury.
The Court also held that disclosure of the defence psychiatric report caused no miscarriage of justice and that provocation may still mitigate sentence after reducing murder to manslaughter.
Both the conviction appeal and the Crown sentence appeal were dismissed.
