'Grease' actor Jeff Conaway, who was last seen trying to get sober in 'Celebrity Rehab,' was admitted to a Los Angeles hospital on Monday with serious injuries after falling down a staircase at his home.

Conaway's girlfriend, Vikki Lizzi, told TMZ that the troubled actor suffered a brain hemorrhage, a broken hip and arm and fractured his neck in the fall.

He remains in an undisclosed hospital, but details of his condition have not been released.