Jeff Conaway

Actor Jeff Conaway, who's been comatose in a Los Angeles hospital, may be taken off life support, RadarOnline reports.

A source close to the situation says, "Doctors advised the family that Jeff has had no brain function since he was brought into the hospital. The feeding tube has already been removed. The ventilator which is breathing for Jeff, will be removed sometime this afternoon. Jeff is in no pain whatsoever."

Jeff Conaway in critical condition

The former Grease star was found unconscious at his home on May 11 and was taken to the Encino Hospital Medical Center. Initially, it was thought that he had overdosed on prescription drugs, but later it was revealed he was suffering from pneumonia and sepsis. He later slipped into a coma.

VIDEO: Dr. Drew addresses Conaway's apparent overdose

Conaway, 60, rose to fame playing one of the T-Birds in the 1978 film adaptation of Grease. Later that year, he co-starred in the popular sitcom Taxi, as actor-turned-taxi-driver Bobby Wheeler, before leaving in Season 4. He later appeared on The Bold and the Beautiful and Babylon 5 in the '90s.

In recent years, however, Conaway has turned to reality TV. He was a contestant on the third season of Celebrity Fit Club, but was forced to leave the show and enter rehab. Two years later, he returned to VH1 to appear on Celebrity Rehab with Dr. Drew, seeking treatment for addictions to cocaine, painkillers and alcohol.

In addition to his substance abuse problems, Conaway has had difficulty walking due to an injury-related back problem.

TVGuide.com was not able to reach Conaway's reps for comment.