According to an unofficial Chantilly High School blog, he was a varsity wrestler and junior varsity lacrosse player (http://thepurpletide.com/wordpress/2013/08/13/senior-killed-on-route-66/ -- currently down, but
http://www.tripleedgelax.com/2011_Fall_VA_Boys_JV_Schedule.htm has him in the JV roster).
The police say they're investigating it as a suicide, which is interesting. Nick Stuban, if you recall, was a lacrosse player and committed suicide (http://www.fairfaxunderground.com/forum/read/2/488541.html). I wonder how many teen suicides in Fairfax County are connected to lacrosse? Of course Stuban had other problems, and of course most lacrosse players in FFX county don't commit suicide. But, suicide can become epidemic among teenagers, and lacrosse is a tight community. Just sayin'.