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August 12, 2014 4:35 PM EDT

Joan Rivers, who died on September 4 at the age of 81 after complications from throat surgery, reflected on Robin Williams the month before her death.

Joan Rivers is an authority on red carpet interviews — and the veteran comedian says Williams was one of the best celebrities to chat with, both for his candor and his zany humor. Below, Rivers reflects on his more serious roles:

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