The appellant appealed his conviction for second-degree murder, arguing that the trial judge erred in allowing the Crown to introduce evidence of his general propensity for violence.
The appellant's defence was that the victim's boyfriend, who had a history of violence against the victim, was the actual killer.
The trial judge ruled that because the defence's strategy would expose the boyfriend's propensity for violence, the Crown could introduce similar evidence against the appellant to ensure fairness.
The Court of Appeal held that this ruling was erroneous and highly prejudicial, as the defence had specifically undertaken not to explore the boyfriend's general propensity for violence against third parties.
The Court also found that the trial judge erred in admitting opinion evidence from a police officer regarding the exclusion of other suspects.
The appeal was allowed, the conviction was set aside, and a new trial was ordered.