Charlie Gibson's Final "World News" Broadcast Set For December 18

Charlie Gibson will sign-off as anchor of ABC's "World News" on December 18, the network announced Tuesday.

Diane Sawyer will assume the anchor's chair on December 21. Her "Good Morning America" replacement is yet to be named, but the New York Times reports that she is expected to leave the morning program on December 11.

The Times' Brian Stelter and Bill Carter describe ABC News' planned transition strategy as
"the anti-Katie," noting that by making the move just before Christmas the network hopes for a low-key, quiet transition (unlike Katie Couric's much-celebrated move to the "CBS Evening News").

Gibson announced his retirement in September but the transition date remained unknown until Tuesday.

"We're going to spend a good deal of time during his final week on the air looking back at the stories Charlie covered, hearing again from some of the remarkable people he interviewed, and paying tribute to our friend and colleague, and the enormous contribution he has made to ABC News over the last three decades," wrote Jon Banner, Executive Producer of "World News."