This is crazy, almost the same thing happen to a group of riders in TX a month ago or so now. My buddy and his wife were riding in a group, they lived, but two others were killed... so crazy. There's so many things I could say about situations like this. This is the number one reason I started jumping instead of getting another bike.
Edit: Looks like they caught the guy involved in my friends accident. I hope they find this other person involved in the link you posted.
http://blogs.dallasobserver.com/sportatorium/2010/11/justice_served_they_caught_the.php