OK well I'm ready to go "back to the drawing board". I have read in numerous posts that this bridge area was a hang-out spot for local teens. We have several in our town...the river, the falls etc.. This is not to say that the girls were doing anything questionable but maybe BG had partied there as a teen. Perhaps BG lives in a 200 mile radius and comes home occasionally to visit parents. Let's say he's approximately 40 and his folks are 70. Most mothers would have trouble believing their son is capable of such a crime. Were there any reunions or old friend's parties over the weekend before the murders.
A guy like this could walk to the spot and back out to his folks home. He would know where to watch for girls. Just thinking..., the areas I'm most familiar with, are places I have lived. I still know the teen hang outs in the city I grew up in.