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David Westin, who guided ABC News through a tumultous 13-year period, told staffers on Monday that he will retire by the end of the year.

Westin took over for legendary executive Roone Arledge in 1997. Since that time, Westin had to deal with the sudden death of longtime World News Tonight anchor Peter Jennings.

In 2006, Westin named Bob Woodruff and Elizabeth Vargas co-anchors of the evening broadcast. Less than a month later, however, Woodruff was seriously injured covering the war in Iraq.

TVNewser has much more on Westin’s decision to leave ABC News.