Veteran broadcast journalist Diane Sawyer has penned a touching tribute to ABC News’ David Muir, who was named in the Time100 Most Influential People of the Year list.

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David Muir, who was named in the TIME100 Most Influential People of the year, received a touching tribute written by ...

David Muir's predecessor on World News Tonight, Diane Sawyer, shared her thoughts on the ABC News anchor in a recent tribute, ...