(CNN) - Diane Sawyer is stepping down as anchor of ABC's World News.
The network announced she'll leave in August.
Sawyer released a statement saying she will remain full-time with ABC working on prime-time specials and other news reports.
She'll be replaced on the nightly newscast by current weekend World News anchor David Muir in September.
While Good Morning America co-host George Stephanopoulos will have the title of "Chief Anchor" and handle big breaking news stories and elections.
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