Mathieu Duguay was 17 when he was last seen on May 22, 2008, in the waters of the Rivière des Prairies, along Montreal’s northern shore. Witnesses reported seeing him in distress and crying out for help in the river’s currents; his personal effects were later found on the riverbank near that location. Authorities conducted searches but never recovered his body.

The Service de police de la Ville de Montréal treats the case as an unresolved disappearance. The prevailing explanation is that he may have drowned after being swept away by strong currents, but without recovery of a body that cannot be confirmed. The disappearance left family and community members without closure.

If anyone saw Mathieu that day or has information about his movements near the Rivière des Prairies on May 22, 2008, please come forward.