Jeff Conaway in a coma after apparent overdose

(HMG Celebrity News) – Those that have seen former “Taxi” star, Jeff Conaway on Celebrity Rehab know that his sobriety was quite fragile after a longtime addictions to cocaine, painkillers and alcohol.

Conaway is now in critical condition at an Encino hospital after an apparent overdose, the actor’s rep confirmed to E! News Wednesday.

“He is in a coma and unresponsive at this time,” said manager Phil Brock.

Family members have been in and out of the hospital waiting for news, Brock said, adding, “He turned his head two days ago, but nothing since.”

There is no word on whether or not doctors expect Conaway to wake up or on what he may have OD’d on.