Colonel Meow, one of the highly-adored Internet cats, died.

On Thursday evening, Meow’s owner announced that the feline, who was two years old, died on Wednesday evening for causes not yet released.

“Colonel Meow passed away yesterday evening,” his caretaker wrote. “I will post more about the details when I've had a few days to grieve. Thank you so much for your understanding, Minions. Your love and support has meant the world to us both. -Slave Beast”

Colonel Meow, a grey Persian-Himalayan, was one of the famous felines of the Internet among the likes of Grumpy Cat, Lil Bub and many more.

Back in November, his owner announced that he was ill after undergoing a risky surgery and blood transfusion, Mashable reported.

“Minions!!! Colonel needs YOU. He has been in the hospital and the doctors don't really understand what's wrong with him,” a post on his fan page read. “He needs YOU to send your amazingly good energy, vibes, and prayers. He has already survived a 50/50 chance surgery, a blood transfusion that they THOUGHT would send him into heart failure and now we need YOU to get him out of the woods. He's a Colonel. And right now he needs his soldiers. Spread that frown and send your recovery and healing vibes ASAP. He told me it was an order.”

Catster reported that fans, which Meow called “minions,” donated over $20,000 to pay for his medical costs and was released from the hospital a week later.

Dubbed the “World’s Angriest Cat,” Meow became famous in late 2012 after his owner posted photos of his nasty disposition online.

The cat was adopted in October 2011 after his owner, Anne Marie Avey, found him on the side of the road in Seattle, Wash. Soon, the Los Angeles resident discovered that her cat, whose angry eyes and furrowed brow made him look mean, could be a source of entertainment for users online.

"I just wake up every morning and I can barely think and I look over at him and he makes me laugh out loud,” Avey told ABCNews. "It's one of those moments where every time I look at him I get a chuckle and I thought that should be shared with everybody.”

That’s when Avey started a Facebook page for Meow, which has amassed nearly 350,000 likes.

“He had all these types of faces and positions he would get into and I just had to share it,” said Avey, admitting that Meow is a “really easygoing and chill” cat.

Colonel Meow was also awarded a Guinness World Record last August for having the world’s longest fur.

“We already knew that he was the best cat in the world, but to be recognised in the Guinness World Records book takes it to the next level,” Avey said.