Jeff Conaway Is In a Coma 20.48K Seth Abramovitch 05/19/11 12:03AM Filed to: Drugs Drugs overdose coma Jeff Conaway celebrity rehab Grease star and former Celebrity Rehab exploitee Jeff Conaway, 60, is in a coma. The Hollywood Reporter spoke to his manager, who says it was caused by an overdose of pain relievers. He was discovered unconscious on May 11.