It just doesn't make sense that some random stranger somehow gets into her flat, kills her and then, instead of running away, puts her body into his vehicle, drives a few miles and dumps her by the side of the road. To me, those are not the actions of a stranger, but somebody who wants to distance the body from the place he's associated with.
It makes every bit of sense if the killer is on the DNA database.
Hasn't that been said before? This thread has been going on for so long that we are going round in circles.