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Joan Rivers guest-starring on an episode of The Carol Burnett Show, Los Angeles, September 25th, 1970.

Joan Rivers authored and co-authored a dozen books, and is seen here at a Barnes & Nobles in Manhattan's Union Square, where she signed copies of her book Diary Of A Mad Diva on June 30th, 2014.

Joan Rivers experienced a well-deserved surge in interest after the release of the 2010 documentary Joan Rivers: A Piece Of Work.

Continuing where she left off with Johnny Carson, Joan Rivers was a regular on the Late Show with David Letterman. She's seen here during an appearance on Dave's show on February 26th, 2013. 

Joan Rivers could take as good as she got. Proof came in the form of her own celebrity roast, and she's seen here with Kathy Griffin onstage at 'The Comedy Central Roast of Joan Rivers' on July 26, 2009 in Studio City, California.

Long a comedians' comedian, Joan Rivers is seen here performing at the Stardust Resort & Casino on June 26th, 2004 in Las Vegas.

Joan Rivers, Donald Trump and Mark Burnett on the finale of The Celebrity Apprentice in 2009.

Joan and Melissa Rivers were red carpet mainstays. The two are seen here at the TV Guide stage during arrivals to the 47th Annual Grammy Awards on February 13th, 2005 in Los Angeles.

Joan Rivers, who often had an adversarial relationship with Hollywood celebrities, was honored with a star on the Walk of Fame on July 26th, 1989 in Hollywood, California. 

Joan Rivers had a decades-long relationship with Johnny Carson's The Tonight Show, and is seen here during a guest-hosting stint on March 6th, 1986. 

Joan Rivers with her late husband Edgar Rosenberg during the premiere of Roxanne at the Pitt Theater on June 19th, 1987 in Los Angeles. 

Nurse Anne Straus holds Joan's daughter, Melissa Frida, as the new mother lights a cigar for her husband, Edgar Rosenberg, on January 22nd, 1968. 

Joan Rivers with host Ed Sullivan on September 11th, 1966.