A 21-year-old Post Falls woman was killed in a one-car rollover that occurred at 1:01 a.m. this morning, according to the Idaho State Police. Brittany Chapman was eastbound in her 2002 Mazda Protege on I-90 near the 4th Street exit in Coeur d'Alene when she lost control of her vehicle.  The vehicle left the roadway and overturned at milepost 12.5. She wasn't wearing a seatbelt. She was pronounced dead at Kootenai Medical Center. The Idaho State Police are investigating the cause of the accident.