"Celebrity Rehab / Crazytown " Star Shifty Shellshock is in a Coma

Former "Celebrity Rehab" star Shifty Shellshock is currently in a coma in an L.A. hospital -- TMZ has learned.

According to sources, the former Crazy Town singer has been in the ICU since last Thursday and is completely unresponsive...
 It's unclear what put him there -- but people close to him believe it was drug-related.

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