• ABC’s George Stephanopoulos will co-anchor tomorrow’s “Good Morning America” live from the scene of the shootings in Tucson, joined by anchor Dan Harris.

• NBC’s Lester Holt is on his way to Arizona, where he will co-anchor “Today” and will contribute to “Meet the Press.”

• CBS’ Erica Hill will be in place for “The Early Show” Monday.

> More: Katie Couric was in to anchor the “CBS Evening News.” David Muir anchored “World News.” “Nightly News” was pre-empted for the NFL playoff game.

> Earlier: Christiane Amanpour to host “This Week” from Tucson, Arizona tomorrow.

> Sunday Updates: Katie Couric is en route to Arizona for coverage. CNN’s Kiran Chetry is also on her way to co-anchor Monday’s “American Morning.” > More: Brian Williams is en route and will be in place for a Dateline special tonight at 8pmET. ABC’s Diane Sawyer is also heading to Arizona for Monday’s “World News.”