Grease Star and Celebrity Rehab Alum Jeff Conaway Dies of Overdose 25.39K Brian Moylan 05/27/11 01:29PM Filed to: rip rip and now he's dead Jeff Conaway Grease Obits overdoses dr drew celebrity rehab Gettypic Tweetg Tweetd Fb Jeff Conaway, who played Kenickie in Grease, and was one of Dr. Drew's reality TV lab rats on Celebrity Rehab in 2008 has died after falling into a overdose-related coma earlier this month. He was 60.