They said she could not overcome complications from a recent urinary tract infection and died on Tuesday morning in the arms of her human mum Tabatha Bundesen.
In this 14 November 2016 photo, Grumpy Cat poses for photos with her owner Tabatha Bundesen in NY.
Grumpy Cat, who sparked many memes, died at age 7.
It's a sad day, but if Grumpy Cat taught us anything, it's to smile even when our world is falling apart.
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Fans could buy Grumpy Cat socks, or an endless choice of tee-shirts emblazoned with ennui-filled slogans such as "Your face.I hate it" or "I don't care what you think, I'm napping".
Grumpy Cat became such a cultural phenomenon that she inspired art projects, perfumes, merchandise, Skechers shoes, comics and even a "Grumppuccino" coffee. She told the Express newspaper that she quit her job "within days" of Grumpy's first appearance on social media.
In 2018, her owners won a $710,000 (£555,000) payout in a copyright lawsuit.
"Grumpy cat will always be a legend in my heart". When she was a kitten, she was named Tardar Sauce. The book "Grumpy Cat: A Grumpy Book" reportedly sold more than 500,000 copies in 15 different languages shortly after it was released, the Hollywood Reporter wrote in 2014. She also had t-shirts, mugs, stuffed toys and books in her name. "I learned much from her and am deeply saddened and devastated to hear of her passing".