KNOXVILLE - For the first time in Knox County judicial history, a judge will instruct the jury in the trial of convicted torture-slaying ringleader Lemaricus Davidson that it is more expensive to execute someone than to sentence them to spend the rest of their life in prison. At the request of defense attorney Doug Trant, Criminal Court Judge Richard Baumgartner said this morning that he will tell jurors that a 2004 study by the state Comptroller's Office concluded that execution is a more expensive form of punishment than life without parole