Did Mary Karr really say "The truth is almost always far worse than your darkest visions"?

No. The line belongs to Hunter S. Thompson. It circulates under Mary Karr's name, and the posts crediting her never cite a book, because there is not one to cite.

The version going around

"The truth, when you finally chase it down, is almost always far worse than your darkest visions and fears." - attributed to Mary Karr

The receipt

The sentence is on page 220 of Thompson's Kingdom of Fear (Simon and Schuster, 2003). We confirmed the wording against scanned copies of the book before publishing this page:

"The truth, when you finally chase it down, is almost always far worse than your darkest visions and fears." - Hunter S. Thompson, Kingdom of Fear, 2003, p. 220

Word for word the same sentence. Only the name changed on its way around the internet.

How a line changes owners

The sentence sounds like a memoirist talking about memory. Karr is one of the most famous living memoirists, and truth-telling about your own life is her actual subject. Attach her name and the quote feels more at home than it does with the man who wrote Fear and Loathing in Las Vegas. So the version that felt right beat the version that was right.

Karr has written whole books about what it costs to tell the truth. She does not need a borrowed sentence, and this one is not hers.

There is a joke buried in the misattribution: a line about chasing the truth down, shared by thousands of people who never chased down where it came from. The chase takes about twenty seconds.

Lumoro sends one morning text a day: a verified quote, a plain reading of what it meant, and one small thing to do with it. Every line gets checked against the original source before it reaches a phone. When a quote fails the check, it does not ship. Some of the failures end up here instead.