The respondent was convicted of second degree murder after killing a man who was allegedly assaulting a third party.
The trial judge instructed the jury on self-defence and the use of force to prevent the commission of an offence, suggesting that excessive force could reduce murder to manslaughter.
The Court of Appeal ordered a new trial.
The Supreme Court of Canada dismissed the Crown's appeal, holding that there is no 'qualified' defence of excessive force under section 27 of the Criminal Code that reduces murder to manslaughter; it is either a complete justification or no defence at all.
However, the Court upheld the order for a new trial because the trial judge's charge to the jury was confusing, improperly included self-defence when there was no factual foundation, and failed to adequately explain the relationship between section 27 and the intent required for murder.