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Joan Rivers: A Piece of Work (movie)

'Joan Rivers: A Piece of Work' documentary stands as trenchant tribute

'Joan Rivers: A Piece of Work' documentary stands as trenchant tribute

Joan Rivers never stopped performing. The comedian, talk-show host and red-carpet critic, who died Wednesday at 81, was a tireless showbiz pro to the very end.

Although she often mined her own life to provide material for her brassy brand of comedy, Rivers' always-on public persona also served as a sort of mask that rarely slipped -- until filmmakers Ricki Stern and Annie Sundberg made the revealing 2010 documentary "Joan Rivers: A Piece of Work," which now stands as an incisive tribute to the late comic legend. (Watch the trailer above.)

Shot over 14 months, "A Piece...

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