(CNN) Grumpy Cat, arguably the internet's most popular cat and one of its first viral memes, has died aged 7.

The furry sensation's family announced her death on Twitter on Friday.

"We are unimaginably heartbroken to announce the loss of our beloved Grumpy Cat," Tabatha Bundesen, Grumpy Cat's owner, said.

Some days are grumpier than others... pic.twitter.com/ws209VWl97 — Grumpy Cat (@RealGrumpyCat) May 17, 2019

"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. She passed away peacefully on the morning of Tuesday, May 14, at home in the arms of her mommy, Tabatha.

"Besides being our baby and a cherished member of the family, Grumpy Cat has helped millions of people smile all around the world -- even when times were tough. Her spirit will continue to live on through her fans everywhere," Bundesen, who lives in Morristown Arizona, wrote.