The sale of a Vicksburg casino has been canceled in the face of antitrust concerns.Eldorado Resorts of Reno, Nevada, said it won't sell Lady Luck Casino in Vicksburg to Churchill Downs of Louisville, Kentucky.The sale was supposed to be a package deal in which the Kentucky company is also buying Presque Isle Downs & Casino in Erie, Pennsylvania.Churchill Downs already owns Vicksburg's Riverwalk Casino Hotel. It was going to pay $51 million for Lady Luck, one of four Vicksburg casinos.Churchill will go through with $179 million Presque Isle purchase, but instead will seek to take over the Lady Luck Casino Nemacolin in Farmington, Pennsylvania, for $100,000. Churchill is also paying Eldorado a $5 million termination fee.Eldorado said the Nemacolin transfer will provide tax benefits.