Another sad turn of events for a former Celebrity Rehab patient.
Jeff Conaway is 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.
The former Taxi star, who also played bad-boy Kenickie in Grease, has been plagued by health problems in recent years, including a bad fall a year ago that occurred when he was under the influence of methadone and OxyContin.
There is no word on what he may have OD'd on today.
He left Taxi in 1982 and worked in television throughout the 1980s and '90s, including a starring stint on Babylon 5.
In 2008, Conaway joined Celebrity Rehab, where he opened up about his longtime addictions to cocaine, painkillers and alcohol.