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Grumpy Cat memes, merchandise brighten up the darkest days with frowns

Credit: DaytonDailyNews

VIDEO: Internet Sensation Grumpy Cat Dead at 7

Credit: DaytonDailyNews

The grumpiest animal on the internet was a viral sensation, bringing smiles with her frown.

Grumpy Cat died Tuesday after she developed a urinary tract infection. Grumpy Cat was 7 years old. Her owners announced the news on social media, saying some days are grumpier than others.

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Explore >>Read: Grumpy Cat, the frowning feline and internet sensation, dead at 7

'Grumpy Cat' on the field before the MLB opening day game between the Colorado Rockies and the Arizona Diamondbacks at Chase Field on April 4, 2016, in Phoenix, Arizona.
'Grumpy Cat' on the field before the MLB opening day game between the Colorado Rockies and the Arizona Diamondbacks at Chase Field on April 4, 2016, in Phoenix, Arizona.

Credit: Christian Petersen/Getty Images

Credit: Christian Petersen/Getty Images