Actor Jeff Conaway, most recently seen on Celebrity Rehab, has slipped into a coma after overdosing last week, possibly on pain pills.

The 60 year old, who starred in such movies as “Grease” and Taxi”, has not moved in two days according to his manager.

In March, former Alice In Chains Bassist and Celebrity Rehab alum Mike Starr was found dead in Salt Lake City. The official cause of death has not been released, but Starr’s roommate has said the former rocker was seen mixing drugs just hours before his death.