LOS ANGELES (Reuters) -Media heiress Shari Redstone abruptly ended talks with David Ellison's Skydance Media on Tuesday, killing the potential sale of a controlling stake in Paramount Global to the independent studio, sources familiar with the negotiations said. The move by Redstone, Paramount's largest shareholder, came just as it appeared an agreement was near. A special committee of Paramount's board had been scheduled to discuss a proposed deal when it received word that Redstone had called off discussions.