The appellant was convicted of aggravated assault against his father.
At trial, the judge instructed the jury on several self-defence provisions of the Criminal Code, including sections 26, 27, 34(1), 34(2), and 37(1).
The jury asked a question regarding excessive force, to which the trial judge provided a misleading response.
The Court of Appeal upheld the conviction by applying the curative proviso.
The Supreme Court of Canada allowed the appeal, finding that the trial judge's instructions were unnecessarily confusing and contained serious errors of law by leaving inapplicable defences to the jury and misdirecting them on the effect of excessive force.
The Court held that the curative proviso could not be applied and ordered a new trial.