Convicted on a theory not pursued by the Crown: new trial ordered in R v Massicotte

One of the most basic guarantees of a fair criminal trial is that the accused knows the case they have to meet. You cannot properly defend yourself against an accusation you were never told you were facing. A recent decision from Ontario's Court of Appeal shows that when that principle breaks down, the conviction is rendered unsafe—even in a case as serious as murder. In R v Massicotte, 2026 ONCA 526, the Court set aside a second degree murder conviction and ordered a new trial, because the accused was found guilty on a theory of liability that neither the Crown nor his own lawyer understood to be in play.

What Happened

The case arose from the 2014 death of William Wapoose, who was beaten and stabbed to death in a Thunder Bay park. Three people were present. The appellant, Jonathan Massicotte, was one of them. He was charged with second degree murder.

The evidence about exactly what Mr. Massicotte was unclear. One key witness, a 16-year-old at the time, was intoxicated during the events, testified years later, admitted gaps in his memory, and watched much of the attack from about 30 metres away in the dark. A second witness — the appellant's former partner, who described incriminating statements he had allegedly made — had serious credibility problems, including a personal stake in seeing him convicted. The trial judge ultimately placed no weight on her evidence at all.

That left the first witness's account. Critically, that account could not establish who actually inflicted the fatal stab wound, or even whether the accused knew that someone had a knife.

The Crown's Position

Because of this evidentiary gap, the Crown conceded that Mr. Massicotte could only be found guilty of murder if the trial judge was satisfied that he was the one who stabbed Mr. Wapoose. If the Crown couldn’t prove that fact, it could only prove manslaughter, not murder.

The defence, in turn, argued that the witnesses were unreliable, that the Crown had not proven murder or manslaughter, and that Mr. Massicotte may not even have been in the park.

Where Things Went Wrong

After hearing submissions, the trial judge reserved his decision. Then he brought the parties back and asked defence counsel to make further submissions on a particular section of the Criminal Code — section 21(1)(a), which deals with what is called "co-principal" liability.

Here is the crucial legal background. Under Canadian law, when several people jointly attack a victim, each participant can be held responsible as a "co-principal" for the death, even if it cannot be proven which one struck the fatal blow. If a participant took part in the group assault while intending to kill or while knowing that serious harm likely to cause death would result, that participant can be guilty of murder — regardless of who actually wielded the knife.

This is a powerful route to a murder conviction. And it was a route that let the trial judge get around the very problem the Crown had conceded: the impossibility of proving who did the stabbing.

The trial judge convicted Mr. Massicotte of second degree murder on exactly this basis. He rejected the Crown's concession, found that Mr. Massicotte participated in the group assault with the intent required for murder, and held that it did not matter whether Mr. Massicotte or the other man inflicted the fatal wound.

The problem was that no one had been told this was on the table.

The Two Failures of Notice

The Court of Appeal, in reasons written by Justice Trotter, identified two related and serious failures of notice.

First, the trial judge never made clear that he was considering convicting Mr. Massicotte of murder through co-principal liability. When he asked for submissions on section 21(1)(a), defence counsel reasonably understood the question to be about manslaughter — because that was the only context in which the Crown had raised group liability. The transcript made this unmistakable: defence counsel expressly stated, on the record, that he understood the Crown's co-party theory to relate "only to the lesser and included offence of manslaughter and not second degree murder." The trial judge did not correct him. The confusion simply continued, and counsel never got the chance to argue against the specific path that ultimately convicted his client.

Second, the trial judge rejected the Crown's concession without telling anyone he was considering doing so. That concession — that murder could not be proven on the weaker evidence alone — was central to how both sides approached the case. When a judge is inclined to reject an important concession by one party, fairness requires giving both parties the chance to address it. The Court drew on a British Columbia decision, R v White, for the principle that a full and fair opportunity must be given to make submissions on a point troubling the court, especially where the court is about to reject a concession the other side reasonably assumed was settled. Here, the Crown was expressly told it would not be invited to make further submissions — a restriction the Court of Appeal found had no legal basis.

Why This Amounted to a Miscarriage of Justice

The Crown argued on appeal that even if defence counsel had misunderstood the situation, better submissions would not have changed anything. The Court firmly rejected that argument.

If defence counsel known that murder via co-principal liability was the live issue, he might have approached the case very differently. He could have made focused submissions on the leading authorities and how they applied to these facts. He could have argued about whether the Crown had actually proven the specific intent required for murder. And — importantly — he could have raised Mr. Massicotte's intoxication that evening. Intoxication can be legally relevant to whether an accused had the intent required for murder, but it would have been irrelevant to manslaughter. Because counsel believed he was arguing about manslaughter, he said almost nothing about it. That silence was a direct product of the confusion.

The Court concluded that Mr. Massicotte was prejudiced by the way his trial unfolded: he was not given sufficient notice of how he could be found guilty of murder, and his lawyer was deprived of a meaningful opportunity to respond. That amounted to a miscarriage of justice. The conviction was set aside and a new trial ordered.

What This Means for Anyone Facing a Serious Charge

Massicotte is a striking illustration of a principle that protects every accused person: you are entitled to know the theory under which the state seeks to convict you, and you are entitled to a real opportunity to answer it. This is not a technicality. The whole design of a criminal trial assumes that both sides are arguing about the same thing. When the actual basis for a conviction only emerges in the judge's final reasons — after submissions are closed — the accused has effectively been convicted of a case they never had the chance to fight.

It is also a reminder of why the details of what happens in a courtroom matter so much. This appeal succeeded in large part because defence counsel stated clearly, on the record, what he understood the trial judge to be asking. That contemporaneous statement is what allowed the Court of Appeal to see, with certainty, that counsel had been operating under a misunderstanding — and that the misunderstanding was not his fault. A less careful record might have left the issue murky.

If you are facing a serious criminal charge, this is part of what effective representation looks like: not only arguing the evidence, but paying close attention to how the case is being framed at every stage, and making sure the record reflects it. Where a trial has been conducted in a way that deprived you of the chance to meet the real case against you, that can be a powerful ground of appeal — as it was here.