Two appellants were convicted of first degree murder in the death of Jagtar Gill, who was beaten with a metal bar, stabbed multiple times, and had her throat slashed.
The Crown's theory was that Bhupinderpal Gill (the victim's husband) and Gurpreet Ronald (with whom Gill was having an affair) conspired to commit the murder, with Ronald as the perpetrator.
The trial judge failed to instruct the jury on the included offence of second degree murder for Ronald, leaving only verdicts of guilty of first degree murder or not guilty.
The appellants appealed on the basis that this instruction was erroneous and prejudicial to both their defences.
The Court of Appeal allowed the appeals, finding that the trial judge erred in law by failing to leave second degree murder as a possible verdict for Ronald, and that this error tainted the verdict against Gill as well, as it undermined his defence that Ronald acted alone without planning and deliberation.