Quebec provincial police are investigating what appears to be a homicide.
Officers were called to a home on Ewing Street in Salaberry-de-Valleyfield just after midnight, where they found a man with very serious injuries.
Sgt. Joyce Kemp of the Sûreté Du Québec said the man had been shot.
He was pronounced dead in hospital early Wednesday morning.
Police so far have no suspects or motive, and are continuing their investigation.