Alex sadly passed away earlier this week (Image: @KipstaUnited/Twitter)

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The heartbreaking final tweet of a popular YouTuber who died after a seven-hour heart operation has been revealed.

Alex Dragomir – known as Sir Kipsta – passed away at the age of 17 earlier this week.

The Manchester United super-fan regularly posted about the club and his health journey online, gaining thousands of followers.

But he said on June 10 that he was going in for a procedure – and warned fans that it might not work.

His last tweet said: "Going in for a life saving procedure. If it don’t work then it’s been a great time people.

"Thank you for all you’ve done for me."

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Alex used to vlog reaction to football matches on his YouTube channel
(Image: @KipstaUnited/Twitter)


His sister then posted from Alex's account the next day and and revealed the devastating news.

She said his "heart couldn't take it anymore" after a seven-hour operation.

And she added: "He had a very hard operation. He was too weak to survive.

"Heaven gained another angel. He was my rock, my everything."

The sister, who didn't want to be named, also told The Sun Online that Alex made her promise she would look after their mum.

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"It's like as if he knew he was not going to make it," she said.

"The last couple of days have been very hard, he was in hospital and his death just happened unexpectedly."

But she added that said she has been overwhelmed by the support she has received since her brother's death.

Celebrities have paid tribute to Alex since his passing, including United ace Marcus Rashford and TV presenter Susanna Reid.

The footballer retweeted a photo of the YouTuber in his hospital bed with his book and said: "My guy.

Alex's death was mourned by celebrities
(Image: @KipstaUnited/Twitter)

"I hope this book brought you at least a little enjoyment at the end. What an absolute superstar, fought until the very end.

"I was always thankful of your support."

'Good Morning Britain' host Susanna then shared Rashford's post, and said: "This breaks my heart."

Alex – who tweeted from the account @KipstaUnited – had more than 21,000 followers on Twitter.

And he had nearly 30,000 subscribers on YouTube, where he began posting about his hospital visits a month ago.

His mum set up a GoFundMe account when her son suffered with heart failure, which people are still donating to.