OMAHA, Neb. (AP) - Susan T. Buffett, the wife of billionaire investor Warren Buffett, died Thursday of a stroke at age 72, the company said. Buffett, chairman of Berkshire Hathaway and a hugely influential investor, was with his wife when she died in Cody, Wyo., where they were visiting friends, the company said. She had been admitted to West Park Hospital in Cody the night before, a hospital spokeswoman said. Susan Buffett, a Berkshire director, was listed this year by Forbes magazine as the 60th richest American, with a personal net worth of $3.1 billion. Though the Buffetts had lived...