The veteran journalist had been struggling with health issues, sitting out the network’s election coverage last week. She had also taken a two-week medical leave in May to “address some ongoing health issues.”

Ifill served as the moderator and managing editor of the political roundtable show “Washington Week,” as well as the the co-anchor of the nightly broadcast “NewsHour” alongside journalist Judy Woodruff.

“Gwen was a standard bearer for courage, fairness and integrity in an industry going through seismic change,” said PBS NewsHour executive producer and WETA SVP​​​ Sara Just in a statement. “She was a mentor to so many across the industry and her professionalism was respected across the political spectrum. She was a journalist’s journalist and set an example for all around her.”

Ifill began her career as a journalist at the Boston Herald-American, before moving on to positions at NBC, The Washington Post and The New York Times. She was appointed moderator of “Washington Week” and senior correspondent for “NewsHour” by PBS in 1999. In 2013, she was elevated to co-anchor and co-managing editor of the nightly broadcast alongside Woodruff.

The author of the book, “The Breakthrough: Politics and Race in the Age of Obama,” Ifill was scheduled to receive the 2016 John Chancellor Award from Columbia University on Wednesday.