I'm talking about stuff like the Original Night Stalker in CA:

https://en.wikipedia.org/wiki/Original_Night_Stalker

Anything similar in Fairfax County?

So far, I had only come across one website that claimed one particular place in Williamsburg, Virginia called The Mill is haunted. Supposedly, Williamsburg's first serial killer had dumped the victim's bodies there. Frankly, when I came across this, I had attempted to investigate by digging on the web for any info about any serial killers who committed multiple murders in Williamsburg, Virginia. Each attempt I had made to find such info, I had no luck. I live across the country, in the western US. So, I would take note of this here and go to the main library in Virginia and look into historical archives section of old newspapers and microfilm records of newspaper articles. If you find anything to validate that this really did happen, that would be interesting. I have an interest in studying and researching cold cases, mostly unsolved serial murder type of cases. If your up and able to do this, I wish you luck.