This is a sad day for comedy fans, as Tonight Show legend David Brenner has passed away after a battle with cancer. 

David, who was 78, died on March 15 at his home in NYC, according to USA Today. He rose to fame in the '70s, thanks to his frequent appearances on The Tonight Show. He holds the record for the most-frequent Tonight Show guest, having appeared on the show more than 150 times. Between 1975 and 1984, he guest-hosted 74 times for then-host Johnny Carson.

David is survived by his three children and third wife Tai Babilonia, the 54-year-old former figure skater whom he married in 2011.

David became a fixture on other talk shows and game shows and had four HBO stand-up specials. He hosted a short-lived syndicated talk show in 1987. And he never stopped working, as he had recently appeared on MSNBC and Fox New Channel and had performed stand-up shows in December 2013. He also appeared in the 2005 documentary film, The Aristocrats.

"David Brenner was a huge star when I met him, and he took me under his wing," says comedian Richard Lewis, known for playing himself on Curb Your Enthusiasm. "He mentored me from day one. ... His passing leaves a hole in my life that can never be replaced."

Our thoughts are with David's loved ones during this very difficult time. Thanks for all the laughs, David. 

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Source: USA Today