If you are Roger's sister, you should have the detective handling Roger's case contact Bill Kirkconnell, SSRA FBI Savannah, GA (912) 232-3716. This is if you would like to pursue a rule in/out of your DNA vs "BK Doe" or "Benjaman Kyle."
The reason the contact should be made is because Benjaman's maternal or Mitochondrial DNA is NOT in the national database, so it would not have been compared to yours in the normal course of events.
FWIW, I do believe there is an answer out there for you regarding Roger. We will help any way we can....another great tool I have found is the social networking sites such as Facebook and MySpace. If you would like to set up groups and create banners, we have resources here that can help.
I am Rogers sister why would I do this if I am not?