In another tragic twist, actor Jeff Conaway has slipped into a coma after an overdose, possibly from pain pills, his manager confirmed Thursday.

Conaway was found unconscious on May 11, and is currently in critical condition at an undisclosed hospital.

The actor, who gained fame with roles in such movies and TV shows as 'Grease' and 'Taxi,' has long battled addictions to drugs and alcohol, which was documented in the 2008 VH1 reality series 'Celebrity Rehab.'

Conaway, 60, was previously hospitalized in 2010 for a broken hip.

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