NEW YORK (AP) - December 2, 2009
The 66-year-old Gibson, who announced his retirement in September, has been at ABC News for more than three decades and plans to continue as an occasional contributor.
He will be replaced by "Good Morning America" co-host Diane Sawyer.
Gibson has anchored "World News" since 2006, and was a co-host of "Good Morning America" for much of the 20 years before that.
