The Lennox and Addington OPP is investigating a serious collision on Hwy 401 eastbound near Palace Road.
On July 24, just after 10:30 a.m., officers responded to a collision involving two vehicles and a transport truck.
An occupant of one of the vehicles was pronounced deceased at the scene. Three others were transported to hospital with non-life-threatening injuries.
OPP Technical Collision Investigators (TCI) are assisting with the investigation which is ongoing at this time.
The highway remains closed with an emergency detour route in place.
Any witnesses to the collision or who may have dash cam video are urged to call the L&A County OPP Detachment at 1-888-310-1122.