Helen Gurley Brown, the former Editor-In-Chief of Cosmopolitan magazine has died today.Brown, who was considered a "true pioneer in journalism," died at New York-Presbyterian/Columbia University Medical Center in New York City. The cause of her death was not disclosed. She was 90 years old. "Helen Gurley Brown was an icon. Her formula for honest and straightforward advice about relationships, career and beauty revolutionized the magazine industry," said Frank A. Bennack, Jr., CEO of Hearst Corporation, publisher of the monthly women's magazine