The Coffin affair was an event in Canadian history in which a man named Wilbert Coffin was hanged for the murder of three men. The affair started in June 1953 in Gaspésie when three men from Pennsylvania were reported missing. Their bodies were found a month later deep in the woods sixty kilometres from the nearest town.
The main suspect in the case was Wilbert Coffin, who was found to have many items belonging to the men in his possession. Coffin was sent to trial in July 1954 and though the evidence against him was mostly circumstantial, he was convicted with one count of murder (as the penal code prohibited multiple convictions of murder in the same trial). On August 5 he was sentenced to hang.
An appeal to the Quebec Court of Queen's Bench was dismissed. Coffin's application for leave to appeal to the Supreme Court of Canada was turned down but the federal Cabinet submitted a reference question to that Court asking: "If the application made by Wilbert Coffin for leave to appeal to the Supreme Court of Canada had been granted on any of the grounds alleged on the said application, what disposition of the appeal would now be made by the court?"
The federal government's decision to take the question to the Supreme Court of Canada caused tension with the government of the province of Quebec. The Supreme Court answered that it would have upheld the conviction of Coffin: Reference re Regina v. Coffin, [1956] S.C.R. 191.
Coffin was hanged at Montreal's Bordeaux Prison on February 10, 1956 at 12:01 AM.
But the story did not end with Coffin's death. Jacques Hébert, a reporter during the trial and later a senator, published two books on the matter: Coffin était innocent (1958) and J'accuse les assassins de Coffin (1963). Hébert's 1963 book caused such controversy that the provincial government established a Commission of Inquiry into the case. Headed by judge Roger Brossard with Jules Deschênes as Counsel to the Commission, over 200 witnesses were interviewed. The commission found that Coffin did receive a fair trial.