The appellant, Margaret Lee Cole, appealed her conviction for first-degree murder in the death of Richard Humble, who died in a house fire.
The Crown's case was based on circumstantial evidence, including the appellant's financial motive (forged documents and will), the presence of a sedative (Alprazolam) in the victim's system (prescribed to the appellant), a false alibi, and other suspicious circumstances.
The Court of Appeal found that the trial judge erred in admitting extrinsic misconduct evidence (the "Chapman letters") and in the jury's instruction on its use, as well as in the jury's instruction on the fabricated alibi.
However, the Court applied the curative proviso under s. 686(1)(b)(iii) of the Criminal Code, concluding that the Crown's case was overwhelmingly strong and that the errors did not cause a miscarriage of justice.
The appeal was dismissed, and the conviction upheld.