The Tennessee Department Of Corrections Has Updated Its Lethal Injection Procedures And Is Resuming Executions. Nikolaus Johnson, Convicted Of Killing Bristol Tennessee Police Officer Mark Vance In November 2004, Is Scheduled For Execution Under The New Rules. He’s Been On Death Row Since 2007. Johnson’s Appeals Were Unsuccessful. The New Procedure Uses A Single Drug Now Instead Of A Three-Drug Cocktail. The Tennessee Supreme Court Will Set The Execution Dates.