(TUSCOLA COUNTY) -- One person was killed and another was seriously injured after a semi truck collided with a car Friday morning in Tuscola County. Sheriff's deputies say the preliminary investigation showed that the car was traveling west on M-46 and started to turn south onto Vassar Road when a semi tractor trailer, traveling east on M-46, collided with the car. A passenger in the car was pronounced dead at the scene. The driver was flown by helicopter for further treatment. It's unknown if the semi truck driver was hurt. No other details have been released. The crash remains under investigation.