According to this article they do have the DNA. They need to run it through that familial DNA database, before Democrats outlaw its use.
https://www.insidenova.com/news/crime_police/who-killed-amy-baker/article_75d68bd8-b7a8-11e3-8782-0019bb2963f4.html
I worked at Ft Belvoir back then. I remember people saying the car was parked on the Belvoir/Newington exit ramp and she was found in the woods of that exit.