Katie Couric to Guest-Host ‘GMA’

Katie Couric announced Thursday morning that she will return to morning television after six years when she guest-hosts Good Morning America during Robin Roberts’s vacation. The move comes as Couric is setting up shop at ABC News for her new talk show, Katie, which is scheduled to premiere in the fall. Couric co-hosted NBC’s morning powerhouse the Today show for 15 years, signing off nearly six years ago to anchor the CBS Evening News. Couric’s turn on GMA comes as the morning show has steadily chipped away at Today’s dominance in the ratings.