YOUTUBE celebrity KEENAN CAHILL dies at 27

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

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

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

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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

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

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

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

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

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