Keenan Cahill has died at the age of 27, following complications from an open heart surgery. The YouTube sensation - famous for his lip sync videos with celebrities - passed away on Thursday afternoon in a Chicago hospital, after being taken off life support according to his manager, David Graham, as per TMZ. Keenan, who was diagnosed with Maroteaux–Lamy syndrome, shared two weeks ago that he was undergoing open heart surgery on December 15. The internet phenomenon worked with a number of A-list stars throughout his career, and in 2011 he appeared alongside Jennifer Aniston in a Smart Water advert. Gone too soon: Keenan Cahill has died at the age of 27, following complications from an open heart surgery according; Pictured 2013'For those who are asking. December 15th is the date of surgery,' he wrote on what is his last Instagram post on December 12. On December 5th he also shared a post that read: 'One week till open heart surgery.
