Jeff Conaway and Vikki Lizzi at the TV Land Awards June 8, 2008 in Santa Monica, Calif.
Vikki Lizzi, Conaway's girlfriend, spoke to the blog, and confirmed that the actor, who was also known for his roles in "Taxi" and "Babylon 5," is currently in a Los Angeles emergency room and will undergo surgery.
Conaway, 59, also suffered a broken hip and arm, Lizzi said.
In recent years, Conaway appeared on "Celebrity Rehab" in 2008 in a bid to fight off his substance abuse problems. The show revealed that Conaway was addicted to cocaine, alcohol, and painkillers.
The actor stated that he had been an addict since he was a teenager, and was the victim of "pedophiles and child pornographers."
Conaway also appeared in VH1's "Celebrity Fit Club," but was forced to leave due to a relapse and entered rehab soon after.