A 49-year-old Red Deer woman died at the scene of single-vehicle rollover near Pincher Creek on Saturday night.
Pincher Creek RCMP said the woman was a passenger in a pickup truck and was ejected from the vehicle.
Her name was not being released pending the notification of next of kin.
Police said the westbound pickup crashed on Hwy 507, about six km east of Pincher Creek, at about 8:30 p.m.
The truck entered the north ditch, then crossed the highway and rolled on its side through the south side of the ditch, and into a grain field.
The 40-year-old male driver, of Pincher Creek, was taken by ambulance to Pincher Creek Hospital and later transported to Lethbridge Regional Hospital.
Pincher Creek RCMP continue their investigation.