(CNN) Mort Drucker, whose distinctive caricatures of celebrities appeared in the pages of Mad Magazine for more than five decades, has died, according to tweets from the magazine and CNN's Jake Tapper. Drucker was 91.

Drucker's death was not a result of the novel coronavirus although he was having trouble breathing, Tapper tweeted.

The cartoonist had been quarantined for weeks with no outside contact, his friend, cartoonist John Reiner, told Tapper.

"Reiner said Mort's last words to him were 'I'm the luckiest man. I've had a wonderful life," Tapper wrote.

In 2015, Drucker was the first winner of the National Cartoonists Society Medal of Honor award. He was also the cartoonist of the year in 1987.

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