Let me throw another possible idea into the mix:
Today, LE arrested Lance Alan Solomon who allegedly killed another man in Logan County OK. They were able to trace Solomon from OK into Mississippi then on to Detroit, MI by purchases using the deceased man's credit cards and phone while driving his stolen 1999 Cadillac Seville (found dumped near the Tate/Panola county line north of Como on Dec. 24th on the side of I-55 near the 258.5 mile marker in Panola County, Miss).
The dates are hard to pin down because they are not certain when the man was murdered due to the condition of his body (found Dec. 15th), but Dec. 2nd LE got footage of Solomon with his victim at Walmart and Arvest bank in Edmond, OK. He also used the card at the Hazlehurst, MS Walmart. I traced the route and it would have taken Solomon within minutes of JC on his way to Memphis, TN. This would put him in the area near the time Jessica Chamber's was burned on December 6th. The stolen car was found dumped straight up I-55 roughly 30 minutes from where Jessica and her car were found burned.
Suspected murderer and thief on the run and driving minutes away from her little town at the time? What are the chances?
Here is the thread on WS with all the links I used to piece this together:
http://www.websleuths.com/forums/sh...ox-65-of-Logan-County&p=11389684#post11389684
ETA: Corrected info on 1st Walmart and Arvest Bank.