Ruth Marcus, a longtime columnist at The Post, said its publisher refused to run her critique of the new focus for the paper’s opinion section.

Ruth Marcus, a columnist and editor for The Washington Post’s opinion section, said Monday she was leaving the newspaper after Will Lewis, the paper’s publisher, killed a column she wrote that was critical of the editorial pages’ new direction.

Ms. Marcus announced her resignation in an email to her colleagues at The Post, saying she had arrived at the decision to resign “with immense sadness.”

“I am taking this step, after more than 40 years at The Post, following Will’s decision to spike a column that I wrote expressing concern about the newly announced direction for the section and declined to discuss the decision with me,” Ms. Marcus wrote.

Ms. Marcus is the most prominent writer to leave The Post’s opinion section since Jeff Bezos, the founder of Amazon

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