"John Walton [No. 11 on Forbes Magazine list of the world's richest people with a net worth of $18.2 billion], the billionaire son of Wal-Mart founder Sam Walton and a member of the company's board, died Monday in a plane crash in Wyoming."
The plane was an experimental ultralight aircraft with a small, gasoline-powered engine and wings wrapped in fabric similar to heavy-duty sail cloth, officials said.[source]
