Jeff Conaway

Jeffrey Charles William Michael Conaway (October 5, 1950 – May 27, 2011) was an American actor. He portrayed Kenickie in the film ''Grease'' and had roles in three television series: struggling actor Bobby Wheeler in ''Taxi'', Prince Erik Greystone in ''Wizards and Warriors'', and security officer Zack Allan on ''Babylon 5''. Conaway was featured in the first and second seasons of the reality television series ''Celebrity Rehab with Dr. Drew''. Provided by Wikipedia