Lambton OPP now say an 82-year old woman died in the crash on London Line.
Police say around 8:45 am yesterday, a pickup truck traveling east on London Line met a car traveling west. At some point, one of the vehicles veered into the path of the other and the crash occurred.
The driver of the pickup, an 85-year old man from St. Clair and the driver of the car, a 62-year old Sarnia woman were taken to hospital with injuries.
The passenger of the pickup truck, Mary Margaret Mullen, died at the scene.
The OPP Technical Traffic Investigators continue to probe the cause of the crash and ask anyone who might of been in the area at the time to call police.