On August 7, 2005 Mr. ABC died from Lung Cancer. Mr. Jennings had been the “World News Tonight� anchor since 1983 until early 2005.

You read the article linked above for more information about his life, but one thing can be said, he worked hard and liked what he did.

From the ABC News article:
“On Dec. 31, 1999, Jennings anchored ABC's Peabody-award winning coverage of Millennium Eve, "ABC 2000." Some 175 million Americans watched the telecast, making it the biggest live global television event ever. "The day belonged to ABC News," wrote The Washington Post, "… with Peter Jennings doing a nearly superhuman job of anchoring." Jennings was the only anchor to appear live for 25 consecutive hours.

Jennings also led ABC's coverage of the Sept. 11 attacks and America's subsequent war on terrorism. He anchored more than 60 hours that week during the network's longest continuous period of news coverage, and was widely praised for providing a reassuring voice during the time of crisis. TV Guide called him "the center of gravity," while the Washington Post wrote, "Jennings, in his shirt sleeves, did a Herculean job of coverage." The coverage earned ABC News Peabody and duPont awards. “