ABC News anchor Bob Gibson retiring at end of the year . -- 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 . Diane Sawyer will take over ` ` World News '' beginning in 2018 . The pair worked together for years on ` ` Good Morning America ''
ABC News anchor Bob Gibson retiring at end of the year . Diane Sawyer will take over ` ` World News '' beginning in 2018 . The pair worked together for years on ` ` Good Morning America ''