It appears he was hit from behind and the motorist left the scene.
Villaneuva appears to have been traveling eastbound in the right lane and was struck from behind by a vehicle.
They still know nothing specific about the striking vehicle, but say it may have minor damage to the right front portion.
Anyone with information is asked to contact Crime Solvers by phone at 1-866-411-TIPS/8477, e-mail at www.fairfaxcrimesolvers.org, text "TIP187" plus your message to CRIMES/274637 or call Fairfax County Police at 703-691-2131.
Helmet tip. Oddly I was going to write about how I was hit on the way home from work on this day last year and the woman was very nice, gave me a ride home and paid for my wheel repair. How that was something to be thankful for.
Not everyone is so lucky