According to Northumberland OPP , around 2:30 p.m., officers responded to a head-on collision involving a pickup truck and car on County Road 35 between Godolphin and Woodview roads, about 7 kilometres west of Campbellford.
Police say two occupants in the car were initially transported to hospital where the passenger was pronounced deceased. The driver remains in critical condition with life-threatening injuries.
The identity of the victim has not been released.
The driver of the pickup truck was not injured, police said.
The cause of the collision remains under investigation.