 A woman walking along a stretch of highway in Fairfax County was hit and killed earlier this morning. Fairfax County police say it happened around 4 a.m. on Leesburg Pike and Downey Drive by Great Falls. Police are investigating the driver of the car remained on the scene. The westbound lanes of Leesburg Pike were shut down for a while at Downey Drive but are now open. A man from Centerville, Virginia is accused of exploiting a young Minnesota girl he met online.