A 40-year-old woman has died after a crash near Yardley Hastings on Saturday, police have said.
The crash happened shortly after 1pm on the B5388 Yardley Hastings to Olney Road, when a red Mercedes 300SL, which was being driven by a 65-year-old man from Olney, collided with a silver Vauxhall Astra.
The Astra was being driven by a 28-year-old man from Milton Keynes and the 40-year-old woman, who was also from Milton Keynes and was a passenger in the Astra, died at the scene.
The drivers of both vehicles were taken by air ambulance to University College Hospital with serious injuries.
Police are appealing for witnesses.
Anyone with information is asked to call the Drivewatch Hotline on 0800 174615 or Northamptonshire Police on 101.