Krauthammer is credited with coining the term “The Reagan Doctrine” for President Reagan’s policy of aiding anti-Communist movements worldwide. He was a leading advocate for the Iraq War and a prominent critic of President Barack Obama, whom he praised for his “first-class intellect and first-class temperament” and denounced for having a “highly suspect” character.
In early June, "A note to readers," was published by The Washington Post, Krauthammer, wrote that he had a cancerous tumor removed from his abdomen in August. There were setbacks in his recovery that prevented him from working, but he thought he was making progress in his recovery.
The cancer has returned in an aggressive form, Krauthammer wrote.
"This is the final verdict. My fight is over," Krauthammer wrote.
In the post, Krauthammer thanked those who have assisted him during his medical treatment. He also thanked his Washington Post and Fox News colleagues, readers and viewers.
Krauthammer said he is leaving this life with no regrets.
The Associated Press contributed to this report.