David Muir speaks with Leroy Walker, who described the emptiness he felt after learning that his son Joseph Walker was killed in Schemengees Bar and Grille in the Maine mass shooting. Authorities said Joseph heroically tried to stop the shooter. "It's empty. I don't know what tomorrow's going to bring." https://abcworldnewstonight.visitlink.me/qW1Mo8 | ABC World News Tonight with David Muir

41K views · 603 reactions | David Muir speaks with Americans who were inside the crowd swelling with people at St. Peter's Square and witnessed the historical moment Chicago-native Cardinal Robert Prevost emerged from the balcony as the 267th pontiff. https://abcnews.link/CiHVxI1 | ABC World News Tonight with David Muir | Facebook

David Muir gives a behind the scenes look at the person who takes World News Tonight on and off the air every night – stage manager Michele Mayer. Charlie Gibson, Diane Sawyer and David share farewell messages ahead of her return to Kentucky. https://abcnews.go.com/ | ABC World News Tonight with David Muir