-- Diane Sawyer will take over nightly news anchor duties for ABC when Charlie Gibson retires from `` World News '' at the end of this year , a network spokesman confirmed Wednesday . American Women in Radio and Television anchor Diane Sawyer retiring at end of the year . Diane Sawyer will take over `` World News '' beginning in end of the year . The pair worked together for end of the year on `` Good Morning America
American Women in Radio and Television anchor Diane Sawyer retiring at end of the year . Diane Sawyer will take over `` World News '' beginning in end of the year . The pair worked together for end of the year on `` Good Morning America