Tony Horwitz, a Pulitzer Prize-winning journalist and author of the 1998 bestseller "Confederates in the Attic," died suddenly at the age of 60.

Horwitz, who won a Pulitzer in 1995 for his Wall Street Journal series on low-wage workers and income inequality in the U.S., also worked for The New York Times and The New Yorker.

He was on a tour for his new book, "Spying on the South: An Odyssey Across the American Divide," published earlier this month, when he died in Chevy Chase, Md., on Monday.

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Cardiac arrest is suspected his death, according to an email to The Associated Press from Sarah Hutson, director of publicity at Penguin Press.

"Confederates in the Attic" received critical praise for Horwitz's chronicling of Civil War reenactments. He is also the author of other acclaimed books including "Midnight Rising" and "A Voyage Long and Strange."

Horwitz, a native of Washington, D.C., was married to Pulitzer Prize-winning author Geraldine Brooks for 35 years and was a father of two.