Jeffrey Charles William Michael Conaway[1] (October 5, 1950 – May 27, 2011)[1] was an American actor and singer, known for playing Kenickie in the movie Grease and for his roles in two American television series: struggling actor Bobby Wheeler on Taxi and security officer Zack Allan on Babylon 5. Conaway was also featured in the first and second seasons of the reality television series Celebrity Rehab with Dr. Drew.

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