Great find! I've been doing some research this evening on the names mentioned in newspaper articles contemporary to the case and I made another interesting connection. In 1959 they searched a local dump for remains, based on the confession of a man who says he buried her there. (This is the man who was found in possession of Audrey's purse). THIS man's family and the Vicknairs are very closely tied historically geographically
too intricately to explain here. I worry a bit that this man could have been falsely implicated or "drew the short straw," but I have no basis for this other than what I know about the attitudes and prejudices of that era. All of my sources are from paid news services and ancestry.com, so I don't think I can link, but if you have access to newspaper archives about the case and start combining names in a search engine, you'll easily find the connections. PM me if you want specifics.
I do want say that just because people in this case are connected, it doesn't make them guilty of anything. Mr. Hotard picked a secluded spot that is "halfway" between Baton Rouge and New Orleans (Gretna), and he quite possibly knew of this particular spot through family (in-laws). Just saying
The sleuthing continues...