Emergency crews responded to the crash in the eastern lanes of Highway 417 near the Casselman exit shortly after 4pm on Friday. Ontario provincial police say one of the two vehicles involved in the collision veered off the road and hit a tree. An adult passenger in one of the vehicles was pronounced dead at the scene. Police say the other four occupants of the same vehicle were taken to hospital with serious injuries. The lone passenger of the other vehicle was treated for minor injuries. The investigation is being assisted by IPP traffic investigators. Anyone with information is kindly requested to contact the Russell County OPP at 1-888-310-1122.