Johnny Carson, an icon of late-night U.S. television, has died at the age of 79. NBC, Mr. Carson's network throughout his run, says Mr. Carson died Sunday from complications of emphysema.

Carson hosted for a record 30 years. Millions of Americans tuned in each night before bed to enjoy Carson's quick wit, smooth interviewing style, and often hilarious opening monologue.

US Television Icon Johnny Carson Dies at 79

Topics of Carson's humor included current events, politicians, and Mr. Carson's own love life -- he was married four times.

US Television Icon Johnny Carson Dies at 79

His retirement in 1992 became a national event that drew some 50 million television viewers.

US Television Icon Johnny Carson Dies at 79

Carson gave many top comedians their first national TV exposure, including David Letterman, Jerry Seinfeld, and Carson's successor as host, Jay Leno.

It was revealed just a few days ago that Carson was still sending in jokes to Mr. Letterman, who has his own late-night comedy show today.