A 22-year-old Oakton man was killed in a single-car crash in Fairfax County, police said.

Shortly before 9 p.m. Saturday, Peter M. Gallagher was driving a 1999 Mazda Prot?g? on Vale Road near the intersection with Valestra Circle when the car went off the road and hit a concrete wall. Gallagher died at the scene, Fairfax County police said.

The driver was not wearing a seatbelt, and police said it is not clear whether speed and alcohol were factors in the crash.