Cosmopolitan wouldn't be what is is today if it weren't for the sexual empowerment makeover that Helen Gurley Brown gave the women's magazine back in the 1960s. But now, readers and journalists alike are mourning the editrix, who passed away on Monday at the age of 90 after being briefly hospitalized at New York Presbyterian/Columbia Hospital.

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Brown is famous for penning her bestselling book, Sex and the Single Girl in 1962. Upon being brought in to revamp Cosmopolitan in 1965, she became an advocate for women's sexual freedom. In 1997, after a 32-year-run, Brown was replaced as the US version's editor-in-chief and held the esteemed title for Cosmopolitan's 59 International editions ever since.

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Cosmopolitan's publisher, The Hearst Corporation, released a statement on Monday afternoon. "It would be hard to overstate the importance to Hearst of her success with Cosmopolitan, or the value of the friendship many of us enjoyed with her. Helen was one of the world's most recognized magazine editors and book authors, and a true pioneer for women in journalism -- and beyond."

Brown married Jaws and Driving Miss Daisy producer David Brown in 1959. (David passed away at the age of 93 in February 2010.) The couple had no children.

This article originally appeared on Former Cosmopolitan Editor Helen Gurley Brown Dies at 90