YouTube powerhouse Keenan Cahill, famous for his lip-synch videos with celebrities, has died.
Keenan's manager, David Graham, tells TMZ ... Keenan had open heart surgery on Dec. 15 but there were complications from the procedure and he was put on life support. We're told Keenan died Thursday afternoon in a Chicago hospital after being taken off life support.
Keenan was diagnosed with a rare genetic disorder when he was a baby, Maroteaux–Lamy syndrome, a progressive condition that causes organs and tissues to enlarge, become scarred or inflamed. Some people who have Maroteaux-Lamy syndrome can also have heart issues, which appears to be the case here.