YOUTUBE celebrity KEENAN CAHILL dies at 27

YouTube powerhouse Keenan Cahill, famous for his celebrity lip sync videos, has died.

Keenan's manager, David Graham, tells TMZ... Keenan underwent open heart surgery on December 15

We're told Keenan died Thursday afternoon at a Chicago health facility after being taken off life support.

Keenan had a huge following on social media... We're told he became one of the first YouTube influencers to rack up over 500 m

Keenan had a huge following on social media... We're told he became one of the first YouTube influencers to rack up over 500 

50 Cent really helped take Keenan's career to the next level... They did a wonderful collaboration on the rapper's song

Keenan's Rolodex got pretty dazzling...he's also worked with Justin Bieber, Ariana Grande, Katy Perry, David Guetta, Britney Spears

Keenan identifies with a genetic disease unprecedented when he was a baby, Maroteaux-Lamy syndrome,

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