Diane Sawyer through the years

Diane Sawyer is shown being crowned Kentucky’s Junior Miss after she defeated 18 other girls in the competition at Louisville Saturday, Feb. 4, 1963.

Diane Sawyer, 17, America's Junior Miss of 1963, takes a few snapshots of New York's skyline on March 18, 1963.

America’s Junior Miss, Diane Sawyer of Louisville, Ky., prior to the start of rain-soaked Senior Bowl football game in Mobile, Alabama on Jan. 4, 1964.

Director-producer Mike Nichols poses with his future wife, Diane Sawyer, and his children at a black tie dinner in New York City, where he is honored by the American Museum of the Moving Image for his contribution to the film industry, on Tuesday, Nov. 16, 1987.

Diane Sawyer and director Mike Nichols as newlyweds holding hands leaving the opening of the Nichols-directed production "Waiting for Godot," at Lincoln Center in New York, on November 6, 1988.

Television newswoman Diane Sawyer in 1990.

Co-anchors Diane Sawye and Barbara Walters of ABC-TV's "Turning Point" get together at a news conference in New York City, on Tuesday, March 8, 1994.

Diane Sawyer and Charles Gibson, co-hosts of ABC-TV's "Good Morning America," interviewed in their studio in New York's Times Square, on Jan. 3, 2002.

Narciso Rodriguez and Diane Sawyer backstage before the start of the designer's showing of his Fall/Winter 2004 collection on Tuesday, Feb. 10, 2004 in New York City.

Diane Sawyer speaks with Janet Jackson in Manhattan's Battery Park during a live televised concert on Wednesday, March 31, 2004. It was Jackson's first TV performance since her controversial Super Bowl appearance earlier that year.

Diane Sawyer arrives at the Legends Ball, an award ceremony hosted by Oprah Winfrey honoring women who paved the way in arts, entertainment and civil rights, on Saturday, May 14, 2005 in Santa Barbara, Calif.

"Good Morning America" anchors Diane Sawyer, Charles Gibson and former anchor Joan Lunden, arrive at Good Morning America's 30th anniversary cocktail party at Lincoln Center in Manhattan on Tuesday, Oct. 25, 2005.

Diane Sawyer during "Good Morning America"'s 30th birthday celebration outside the ABC studios in Times Square on Thursday, Nov. 3, 2005.

Kenny Chesney plants a kiss on "Good Morning America" co-host Diane Sawyer after performing on the show outside the ABC television studios in Times Square on Monday, Nov. 7, 2005.

???Ellen DeGeneres and Diane Sawyer arrive for the 2006 Matrix Awards on Monday, April 3, 2006 in New York City. The awards acknowledge outstanding women who have distinguished themselves in the communications fields. DeGeneres, who was hosting the event, was also being honored with a special Humanitarian award to be presented by Sawyer.

??Speaker of the House Nancy Pelosi with Diane Sawyer during an interview in Washington, DC on Thursday, Jan. 18, 2007.

Diane Sawyer during an exclusive ABC News interview with Nicole Richie in July 2007 in Manhattan.

Jennifer Lopez and Diane Sawyer on "Good Morning America"'s Fall Concert Series in Times square on Tuesday Oct. 9, 2007.

Diane Sawyer with singer Carrie Underwood during the "Good Morning America" fall concert series in Times Square on Tuesday Oct. 23, 2007.

Diane Sawyer presents a Woman of the Year award at the 18th Glamour Women of the Year awards at Lincoln Center's Avery Fisher Hall on Monday, Nov. 5, 2007 in Manhattan.

ABC's "Good Morning America" co-anchors Diane Sawyer and Robin Roberts during the morning show's broadcast from Times Square on Friday, April 25, 2008.

Mariah Carey with Diane Sawyer during a performance on ABC's "Good Morning America" in Times Square on Friday, April 25, 2008.

TV personality Diane Sawyer and husband director Mike Nichols attend MoMA's Mike Nichols retrospective opening night screening of "Carnal Knowledge" at the Museum of Modern Art in Manhattan on April 14, 2009.

Former Speaker of the House of Representatives, Newt Gingrich, speaks with host Diane Sawyer on the set of "Good Morning America," Wednesday, May 20, 2009. Gingrich called for the resignation of current House Speaker Nancy Pelosi.

From left, Diane Sawyer, Jamie Foxx and television talk show host Gayle King attend a UJA Federation honors luncheon at The Pierre Hotel on Thursday, June 18, 2009 in Manhattan.

Diane Sawyer and Jamie Foxx at his concert on "Good Morning America" in Central Park in New York City on June 19, 2009.

Diane Sawyer during a tour of the site of the upcoming Democratic National Convention in Denver on Sunday, Aug. 24, 2008.

"Good Morning America" co-hosts Diane Sawyer and Robin Roberts, right, with Whitney Houston during taping of the morning shows in Central Park on Tuesday, Sept. 1, 2009.

Diane Sawyer interviews Rihanna about her relationship with ex-boyfriend Chris Brown in New York. The interview aired on "Good Morning America" Thursday, Nov. 5, 2009, on the prime time news program "20/20" the following day.

Diane Sawyer with her "Good Morning America" colleagues, from left, Chris Cuomo, Robin Roberts and Sam Champion on her last day as co-anchor of the early morning news show on Friday, Dec. 11, 2009 in Manhattan. Sawyer went on to take over the "World News" anchor chair on Dec. 21, succeeding Charles Gibson, who will retired on Dec. 18.

Diane Sawyer on her last day as co-anchor of "Good Morning America," Friday, Dec. 11, 2009.

ABC World News anchor Diane Sawyer taping a news brief before her live evening broadcast from Manhattan on Dec. 21, 2009.

Diane Sawyer and Mike Nichols arrive at the 38th AFI Life Achievement Award honoring Mike Nichols held at Sony Pictures Studios on June 10, 2010 in Culver City, Calif.

Diane Sawyer and director Mike Nichols arrive at the AFI Lifetime Achievement Awards honoring Mike Nichols, presented by TV Land at Sony Pictures Studios on Thursday, June 10, 2010 in Culver City, Calif.

Diane Sawyer and Katie Couric in the studio with ABC News President Ben Sherwood, background left, and Ross Levinsohn, background right, Yahoo's Executive Vice President of Americas, during a news conference in New York City on Monday, Oct. 3, 2011.

"Modern Family" actress Sofia Vergara with Diane Sawyer at the ABC News-Yahoo! News reception during the White House Correspondents Dinner in Washington on April 28, 2012.

Diane Sawyer receives an honorary Doctor of Letters degree from Brown University during the university's 244th commencement exercises on Sunday, May 27, 2012, in Providence, R.I.

Diane Sawyer and George Stephanopoulos during election night coverage early Wednesday, Nov. 7, 2012, from ABC News' Times Square Studios in Manhattan.

ABC News’ Diane Sawyer speaks exclusively to New Jersey Governor Chris Christie at his home in Mendham, N.J., Thursday, March 27, 2014. The Governor insisted that he “did nothing to create the environment” that prompted some of his former top aides to cause a traffic nightmare at the George Washington Bridge last fall.

Amanda Knox speaks with Diane Sawyer during an ABC News interview in New York City on April 9, 2013. The previous month, Italy's highest criminal court overturned her acquittal in the 2007 slaying of British student Meredith Kercher and ordered a new trial.