YouTube star Keenan Cahill has tragically died aged just 27.
The singer, best known for his lip sync videos with celebrities, died from complications following open heart surgery, his manager David Graham told TMZ.
According to the publication, his manager said that Keenan had the surgery on December 15, but suffered from complications afterwards and was put on life support.
He died at Chicago hospital on Thursday afternoon after being taken off life support.
The YouTuber had Maroteaux–Lamy syndrome, a progressive condition that causes many tissues and organs to enlarge, become inflamed or scarred, and eventually waste away.
In his last Instagram post, Keenan had told fans that he was due to have surgery on December 15. Underneath, fans paid tribute to the star, with one writing: "Core YouTube childhood memories from you. Fly free in the eternal sky."
While another commented: "Rest in peace, you were someone i loved as a child. itsucks to hear the news of your passing. Thank you for being able to put a smile on thousands of faces over the years. rest easy Keenan."
A third wrote: "Rest in peace, thank you for being a highlight for my childhood."
Keenan launched his very first lip sync video on YouTube in August 2010 to Katy Perry's Teenage Dream. He went on to collaborate with a number of famous stars, including 50 Cent, Jennifer Aniston, Maroon 5 and Flo Rida.
