Diane Sawyer Steps Down as Anchor of ABC's World News
06/25/2014 AT 09:45 AM EDT
The network said Sawyer will concentrate on interviews and specials. During her tenure, ABC's World News was a steady second to Brian Williams at NBC, although the ABC broadcast has made gains among younger viewers.
Muir is familiar to World News viewers as a substitute for Sawyer and has traveled around the country for his "Made in America" series.
ABC said George Stephanopoulos will take on a new role as chief anchor for live news events.