Police are investigating what led to a fatal head-on collision at the entrance to Turtle Mountain Provincial Park.
A pick-up and a tractor trailer collided on Highway 10 Saturday morning.
One woman, a passenger in the pick-up, died at the scene. A man who was also a passenger was airlifted to hospital in critical condition. The female driver was taken to hospital with non-life threatening injuries.
All three are from Sioux Valley First Nation.
The driver of the semi was not hurt.
Police don't believe alcohol or speed were contributing factors.