Revealing the news of Grumpy's death, the cat’s owners said: "Some days are grumpier than others..."Despite care from top professionals, as well as from her very loving family, Grumpy encountered complications from a recent urinary tract infection that unfortunately became too tough for her to overcome.

The seven-year-old cat, real name Tardar Sauce or Tard, became one of the internet’s first “petfluencers” after gaining fame online for her perpetually gloomy gaze, launching an empire worth millions.