I've just spent a rather harrowing hour looking in to the Dennis Rader killings. I watched this you tube video of his confession of killing Dolores E Davis, thanks to Buzz for finding Mrs Davis.
https://www.youtube.com/watch?v=OaDE1GEVm8wDuring which he references a Mrs Hedge. So I found this:
https://www.youtube.com/watch?v=6NPCzLuB14cOn these two occasions he removed the victims bodies from their homes. Although he doesn't say why, Mrs Hedge actually lived on the same street as him, so body removal makes sense.
He didn't seem to have any connection to Dolores Davis though.
The only other thing I found was this snippet:
"Lately he also started to change the disposal site of one body in order to throw police out of his identification."
http://www.criminal-psychology.net/site/tag/dennis-rader/Whether they mean Mrs Hedge or Mrs Davis, isn't clear.
Watching the video, I kept waiting for the judge to ask him why he moved the bodies. He didn't.
As an aside, Dennis Rader is absolutely terrifying.