Grease Star in Coma After OD Jeff Conaway in critical condition By Rob Quinn, Newser Staff Posted May 19, 2011 3:42 AM CDT 13 comments Comments In this Oct. 13, 2009 photo, Jeff Conaway arrives at the 2009 Fox Reality Channel Really Awards in Los Angeles. (AP Photo/Chris Pizzello, File) (Newser) – Former Celebrity Rehab patient Jeff Conaway is in critical condition in a California hospital after an apparent drug overdose. The 60-year-old actor, who starred as bad-boy Kenickie in Grease and as wisecracking Bobby Wheeler in the sitcom Taxi, "is in a coma and unresponsive at this time," his rep tells E! Online. Conaway, who opened up on reality shows about his addictions to cocaine, painkillers, and alcohol, has struggled with health problems in recent years.