After five years Diane Sawyer is stepping down as ABC's "World News" evening anchor at the end of the summer, to be replaced by David Muir.
ABC said Ms. Sawyer, 68, will concentrate on interviews and specials. During her tenure, "World News" was a steady second to Brian Williams at NBC, although the ABC broadcast has made gains among younger viewers.
Mr. Muir is familiar to "World News" viewers as a substitute for Ms. Sawyer and has traveled around the country for his "Made in America" series. He will assume the permanent anchor spot on Sept. 2.
ABC said George Stephanopoulos will take on a new role as chief anchor for live news events.