The 51-year-old journalist has paid tribute to his former NBC Nightly News co-star Lester Holt, who announced his departure from the show after more than a decade in the hot seat
Fellow longtime anchor David Muir was among the many journalists who shared their surprise with messages bidding Lester farewell (he will be moving to a full-time position on Dateline ).
Veteran news anchor David Muir has hosted ABC News' World News Tonight since 2014, so his co-star's bombshell exit news will likely have shaken his world up.