Here's a route that I was speculating about:
http://goo.gl/maps/sG8dq
Imagine a truck speeding down Woodcrest, hooking that sharp right onto Roundrock, possibly fishtailing a bit then hooking the left onto Cindy, the intersection where the body was found.
Also, I asked about the belt, because I would assume that a clever perp would not intentionally leave his own presumably DNA-filled belt at the scene. There are other possibilities, just wondering which one you favored if you felt the body was left there intentionally (belt = strap, belt was new, perp made a mistake, perp intentionally used someone else's belt to frame them, perp grabbed something from the home but he came from elsewhere, perp had access to a belt from a thrift store and used it as a red herring, etc).