Kathy Hutchins/Hutchins Photo
05/18/2011 AT 07:15 PM EDT
alum Jeff Conaway is back in the hospital following an apparent overdose.
star, 60, who has had a longtime public battle with cocaine, painkillers and alcohol, is in critical condition at Encino Hospital Medical Center unconscious with pneumonia, according to the Los Angeles Times
The troubled actor is also known for his role as Kenickie, the suave T-Birds member who starred in Grease
alongside John Travolta and Olivia Newton-John.
In January 2010, Conaway fell down a staircase and suffered
a broken hip, a broken arm, a fractured neck and a brain hemorrhage.