Main road closed following two-vehicle crash
The force said a man was driving southbound between Ashby St Ledgers and Daventry when his black Hyundai Ioniq car was in collision with a white DAF lorry travelling in the opposite direction.
The driver of the Hyundai, a man in his 50s, died at the scene.
The lorry driver was taken to hospital with minor injuries.
Collision investigators are now appealing for anyone who saw the collision, or who has information about it including relevant dashcam footage, to contact them.
The A361 is the main route between the town and Daventry International Railfreight Terminal (DIRFT), as well as the M1.