Diane Sawyer Announces Last Week on 'Good Morning America'

After 10 years on "Good Morning America," Diane Sawyer announced this morning that will step down as co-anchor this week. "I've calculated -- 2,881 shows," Sawyer said. "Roughly." Sawyer, 63, will take over the "World News" anchor chair, starting Dec. 21, succeeding Charles Gibson, who will retire Dec. 18. "I hope you celebrate with us this week, laugh with us this week," Sawyer said. "It is so difficult," co-anchor Robin Roberts said today, calling Sawyer "my Thelma. Thank you, we are...Full Story