Carole Rhéaume was one of two people who parked their cars on the right side of the highway near Eastman, and crossed over to see if a driver who got into an accident was alright.
They were struck by other vehicles as they were crossing back to their own cars.
The 47-year-old from Varennes, Que. was taken to hospital where she died late Monday night.
A man in his 40s was also hit, however police say his life is not in danger.