Source: Jeff Conaway 'not getting better'

Things aren't looking good for Jeff Conaway.

"He is not getting better," a source close to the former "Taxi" star tells E! News. Conaway was hospitalized a week ago for what was originally believed to be a prescription pill overdose after he was found unconscious at home.

Dr. Drew Pinsky, who treated Conaway on "Celebrity Rehab," later clarified that the 60-year-old actor was suffering from pneumonia and sepsis, a possibly deadly blood infection, and was in a medically induced coma.

And Conaway remains in critical condition.

"He was excessively using prescription meds," the insider says, echoing what Conaway has talked about many times over.

Conaway told E! News last year that he was taking up to 54 OxyContin pills a day, saying that he had "a strong constitution."

"It takes a lot to put me down," he joked.

Meanwhile, ex-girlfriend Vikki Lizzi posted a video on Facebook of the two of them singing together at a charity event in December.

"Our last performance together...'I Got Love' which we co-wrote together and his inspirational song 'Heal Me.' Sending powers to Jeff through St Jude, the worker of miracles," Lizzi wrote.

The estranged pair filed dueling restraining orders earlier this year, but we hear that Lizzi has been trying to get legal permission to visit Conaway in the hospital.