Embedded Player Joshua Levs reports that authorities in DeKalb County, Ga., are conducting their largest investigation ever into the murder of Derwin Brown. Brown was the sheriff-elect when he was gunned down in his driveway in December, three days before he would have taken office. Brown had promised to overhaul operations at the county jail, which he called a cesspool of corruption. Thirty-six detectives are on the case, but so far no murder suspects have been named. Three men have been charged with lying to investigators.