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 two television series: struggling actor Bobby Wheeler in Taxi 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.
Conaway was born in Manhattan, New York, and raised in the Astoria, Flushing and Forest Hills neighborhoods of Queens.
His father, Charles, was an actor, producer, and publisher. His mother, Helen, an actress who went by the stage name Mary Ann Brooks, taught music at New York City's Brook Conservatory. They divorced when he was three, and Conaway and his two older sisters lived with their mother.