David Martin could death penalty for killing Jaycee McWilliams in March of last year. He beat her with a hammer and then dumped her body in the woods near Middleburg.
Police say they tracked Martin's cell phone to the spot McWilliams' body was found.
The defense claimed that he did steal her card but that someone else murdered her and was blackmailing Martin.
It took the jury a little over an hour to return a guilty verdict.