The crash happened near the town of Hawkesbury — about 100 km (60 miles) northeast of Ottawa — after the man stopped to pick up 20-year-old Mandy Deschambeault.
“The male driver proceeded to step out of his vehicle momentarily at which point the female jumped in the driver seat, stealing the male person’s car,” local police said in a statement Monday.
“She proceeded to lose control of the … car, crossing the other lane hitting trees. The female was ejected from the vehicle and found to be without vital signs.”
Deschambeault was pronounced dead in hospital.