Emergency services were called to Sainte-Brigide-d'Iberville shortly after 14:30 local time on Saturday afternoon, where they found the aircraft on fire and declared its occupants dead at the scene, according to Sgt Audrey-Anne Bilodeau of the Sûreté du Québec.
The aircraft appeared to be a private helicopter, Bilodeau said. The crash site is located near the Rang des Écossais road off Highway 10.
Police were notified by an emergency call reporting a helicopter in distress that may have crashed and caught fire. An hour after the call, the fire at the site had been brought under control, though officials were still working at the crash site just before 22:00 local time.
An investigation into the crash is being led by the Major Crime Unit of the Sûreté du Québec, working alongside crime scene technicians as well as investigators from the Transportation Safety Board of Canada. Bilodeau said identifying the victims may "take a few days."