(Richard Vogel | AP file photo) Grumpy Cat poses for a photo in Los Angeles. Grumpy Cat, whose sour puss became an internet sensation, has died at age 7, according to her owners. Posting on social media Friday, May 17, 2019, her owners wrote Grumpy experienced complications from a urinary tract infection and “passed away peacefully” in the arms of her mother on Tuesday, May 14.