Famous cat Lil Bub has died at the age of 8.

On Monday, the feline’s owner, Mike Bridavsky, posted on social media that his beloved friend had passed on Sunday.

“We lost the purest, kindest and most magical living force on our planet. BUB was cheerful and full of love laying in our bed with us Saturday night, but unexpectedly passed away peacefully in her sleep,” wrote Bridavsky in Lil Bub’s weekly newsletter.

It’s me, Mike – BUB’s dude. BUB has departed, she’s on her way home. – https://t.co/8pGC6fVy4apic.twitter.com/trkosFT2uR

— Lil BUB (@IAMLILBUB) December 2, 2019

Bridavsky explained that he’s been “fully transparent” about Lil Bub’s poor health and that it “was no secret that she was battling a persistent and aggressive bone infection.”

Despite that, he says he wasn’t “expecting her to pass so soon or so abruptly without warning.”

“I truly believe that she willingly made the decision to leave her failing body so that our family would not have to make that difficult decision ourselves,” he said in the newsletter.

Lil Bub became a viral celebrity in 2011 when her photos took off after being posted on Tumblr and then later on Reddit. Born with several genetic mutations, the animal had an extreme form of feline dwarfism that led to her tongue always hanging out because of a shorter lower jaw and toothlessness; she also suffered from osteopetrosis, a bone disease that makes bones abnormally dense and prone to breakage. 

After achieving internet stardom, the feline went on to helm the documentary “Lil Bub & Friendz,” which won the Tribeca Online Festival Best Feature Film. She was also the focus of the book “Lil Bub’s Lil Book: The Extraordinary Life of the Most Amazing Cat on the Planet,” which came out in 2013.

Bridavsky highlighted more of Bub’s achievements in his note about her death: “She has literally saved thousands of lives (both pets and humans), she started the first national fund for special needs pets, she was the subject of groundbreaking genetic and biological research, she’s helped raise over $700,000 for animals in need, and has spread a message of determination, positivity, and perseverance to people all over the world,” he wrote.

“And even though my heart is absolutely crushed by her graceful departure from planet Earth, I know that her sprit, magic, and overwhelming energy are still with us, reminding us every day to be better.”

Many on social media mourned the passing of the furry friend:

I met a lot of internet-famous animals when I worked with BuzzFeed and none of them moved me like Lil Bub, who was truly magical and whose dude just radiated with love and care for her. I cried for them when I read this, but I’m so happy they found one another. https://t.co/5CWSRgNgaq

— Summer Anne Burton (@summeranne) December 2, 2019

Lil bub passed away. I’m sad 😭😭 pic.twitter.com/3JZo6jpsWm

— Melody (@mel_o_dee) December 2, 2019

Lil Bub has left this plane of existence.

Thank you for bringing so much joy into this world, you sweet, goofy creature.

In our hearts always. pic.twitter.com/rbHbAoeKeR

— Kyle Gaddo (@kylegaddo) December 2, 2019

LIL BUB WAS A BEACON OF LIGHT AND SHE WAS TRULY BETTER THAN EVERYONE

— Anne T. Donahue (@annetdonahue) December 2, 2019

— Jill Hopkins (@Jillhopkins) December 2, 2019

Thank you, Lil Bub, for bringing joy into our lives. 😞 pic.twitter.com/LmtEs98rXY

— Lamar the Revenger (@RevengerLamar) December 2, 2019

you know what lil bub did that was really fucking cool? reminded us all that we’re a bunch of beautiful freaks and how special it is to be a beautiful freak.

— dedicated to JVs who came feet first (@JVeezus) December 2, 2019

So sad to hear that Lil Bub has passed away. We’ve lost a legend but kitty heaven has gained an adorable four legged angel. RIP you cutie 🐱😭 pic.twitter.com/RfPUgUW0s9

— Shaybells 🎄🎅🎁 (@NerdyGirlShay) December 2, 2019

You were a quality, cute, alienesque cat Lil Bub.

Thank you for your service to all of us humans. pic.twitter.com/obqtqLz8J1

— 🤴🏾🤴🏾🤴🏾Magi! at the Manger🌠 (@katynotie) December 2, 2019

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