Authorities have identified a female motorist who was killed in north Cobb County on Thursday afternoon when she apparently lost control of her Toyota Corolla and crashed with a truck on Shallowford Road near I-575, police said.

The woman, Karen Grace Thomas, 51, of Kennesaw,  was the sole occupant of the Toyota, according to Sgt. Dana Pierce, spokesman for the Cobb County police.

Thomas' car was traveling eastbound on Shallowford about 500 yards west of the I-575 bridge shortly before 2:30 p.m. when the vehicle dropped off the right side of the road, Pierce said.

"Apparently in trying to get back onto the roadway, she overcorrected, causing the back end to come around," he said. "She crossed the double yellow line and was hit on the passenger side door by a 2002 silver Nissan Frontier truck."

A witness called 911 at 2:18 p.m., and Cobb County police and fire department units responded.

The woman was pronounced dead at the scene, Pierce said. The Nissan's two male occupants, driver Victor Carlton Carter, 25, and passenger Anthony Fancis Studer, 17, were not injured.

Shallowford Road was shut down but was expected to be reopened by 4:30 p.m.

The accident is under investigation, but alcohol did not appear to have been a factor, Pierce said. No citations were expected to be issued.