7:30 a.m. Update: A man died in a car crash in Fairfax County Monday that shut down part of Interstate 66 for hours.

The crash occurred about 3:45 p.m. just west of the Fair Oaks Mall. One car ran off the road and struck a guardrail. It then swerved back into traffic and struck an SUV, which overturned, state police said.

They said its driver, who was not wearing a seatbelt, died at the scene. Police said the man lived in South Carolina, but they did not immediately release his name. The other motorist was not injured.

All westbound lanes were reopened at 7:55 p.m.

— Martin Weil

6:40 p.m. Update: The accident investigation continues. There is no new estimate yet on when the roadway will reopen.

5:55 p.m. Update: I-66 West remains closed.

4:45 p.m. Update: Virginia State Police say they are on the scene investigating a fatal crash at Intestate 66 and Fairfax County Parkway.

The two-vehicle crash occurred about 3:43 p.m., authorities said. Traffic will be closed until about 5:30, they said.

Delays begin near Nutley Street and extend for about six miles, officials said.

Original post: Interstate 66 West is shut down between Route 50 and the Fairfax County Parkway due to an accident. Traffic is being diverted to Route 50.

Traffic reporting services say delays are approximately 40 minutes.