William Kristol, the conservative columnist, and The New York Times have quietly ended their relationship after little more than a year, the newspaper said on Monday.

A single sentence printed below Mr. Kristol’s weekly column in the Monday issue broke the news: “This is William Kristol’s last column.” His column itself made no reference to his departure, and the paper did not release a statement.

Also Monday, The Washington Post announced that it had hired Mr. Kristol to write a monthly column and contribute to its opinion blog, PostPartisan.

Image William Kristol will write for The Washington Post. Credit... Brendan Hoffman/Getty Images

“It was mutual agreement,” Andrew Rosenthal, the editorial page editor, said of the change. “We discussed this before the election, and decided that we would end now.”