Police are still trying to determine why the driver lost control of the car.
The car careened off the road on a curve close to the intersection of the Route de Rougemont and the Rang des Trente, rolling several times before it came to a stop when it hit a piece of farm machinery in a field.
The incident happened at about 3:20 a.m. on Saturday.
The driver and the passenger, both in their 50s, were killed.
Both of them were well-known in the community, and two first responders who knew the pair had to be treated for shock.
Richelieu-Saint-Laurent regional police Capt. François Cinq-Mars said the men were on their way home from a party.
Police said it’s possible that the driver was speeding and under the influence of alcohol.