Pierre Duff

In the autumn of 1972, the landscape of Mascouche, a community on the north shore of Montreal, was a mix of rural fields and burgeoning suburban development. It was a place where nature and an expanding city met, with small streams and wooded areas still common. On Friday, November 10, 1972, this setting became the scene of a grim discovery. A group of horseback riders near Masson’s Road found a body in a small stream. The Sûreté du Québec, the provincial police force, was called to the scene, and an investigation into a dark mystery began.

The victim was soon identified as Pierre Duff, a 20-year-old male from Montreal. Investigators quickly determined that he had been murdered. The official timeline of his last known movements was tragically short. He had been reported missing from Montreal on November 4, just six days before his body was found some 30 miles away. For those six days, his whereabouts were a complete blank. What happened to him after he disappeared and why he was targeted remains unknown. Police at the time worked to piece together the final moments of his life, but the trail soon went cold.

The investigation fell under the jurisdiction of the Sûreté du Québec's homicide squad. In 1972, police work relied heavily on witness testimony, interviews, and shoe-leather detective work. Without the forensic advantages of DNA technology that are common today, solving a homicide where the victim was moved to a remote location presented immense challenges. The case of Pierre Duff was one of many from that era that, despite the best efforts of investigators, was left with more questions than answers. His address was unknown to police at the time of the discovery, suggesting a life that was perhaps transient or not easily traced.

Decades have passed, turning the active investigation into a cold case. The file on Pierre Duff remains open, a silent testament to a life cut short and a crime left unpunished. Public records and news archives offer very little about the young man himself. Who he was, what he did for a living, who his family and friends were—these essential details of his life have faded from the public narrative, leaving only the stark facts of his death. He is remembered not for how he lived, but for the brutal and mysterious way he died. This lack of information is a profound part of the tragedy, erasing the portrait of the person behind the name.

The fields and streams around Mascouche have changed dramatically since the 1970s, with much of the area now developed. Yet, the memory of this unsolved crime lingers. For more than half a century, the Sûreté du Québec has kept the file active, waiting for the one piece of information that could break the silence. Investigators believe that even after so many years, someone, somewhere, may hold knowledge about what happened to Pierre Duff in November 1972. A single memory or a long-held secret could be the key to finally understanding the events that led to his death.

As of May 2026, Pierre Duff's case was featured by CTV News in a series on Montreal's unsolved homicides, a reminder that justice for him has not yet been found. The Sûreté du Québec continues to seek public assistance in this and other cold cases. Anyone with information that could help solve this crime is urged to contact the Centrale de l’information criminelle of the Sûreté du Québec at 1-800-659-4264.