The social media star had told his fans he was having the surgery before the surgery, warning fans that he might not get it done.
A super Manchester United fan, real name Alex Dragomir, wrote on Twitter: “I am embarking on a rescue procedure. If that doesn’t work, then it’s a good time, folks.
“Thank you for everything you have done for me,” concluded her last post.
A GoFundMe page had been launched to raise funds for the operation after heart failure.
The page said his condition “has worsened over the years to the point where he has had to be hospitalized where he will live until he receives a heart transplant.”
Her sister then informed her fans, writing, “Hello, as you may already know my brother passed away today.
“He underwent a very hard operation that lasted 7 hours but his heart couldn’t take it anymore, he was too weak to survive.
“Heaven has won another angel. He was my rock, my everything. “
The online star had nearly 15,000 subscribers on his YouTube channel where he spoke regularly about football and shared his journey in the hospital.
He posted to the video-sharing site just four days before his tragic death, in a download that saw him open 100 packs of Panini Premier League stickers from the hospital.
Teachers at his former school, Cockshut Hill in Birmingham, paid tribute to their former student, saying: “Our thoughts and prayers are with his family and friends during this difficult and sad time. “