The accident happened around 4 p.m. between exit 19 and 20, closing the highway for several hours.
An eastbound car crossed the centre line and collided with a large truck.
A 70-year-old man from Bridgewater died at the scene of the collision. The driver of the truck was shaken, but unharmed.
A RCMP traffic analyst was brought in investigate and the cause of collision is under investigation.