Officials decided to call the race, but the drivers did a five-lap tribute to Wheldon. IndyCar Series CEO Randy Bernard made the official announcement of Wheldon's death without further comment.
"IndyCar is very sad to announce that Dan Wheldon has passed away from unsurvivable injuries," Bernard said. "Our thoughts and prayers are with his family today. IndyCar, its drivers and owners, have decided to end the race. In honor of Dan Wheldon, the drivers have decided to do a five-lap salute to in his honor."
Wheldon, 33 and the 2005 series champion from Emberton, England, was competing in only his third IndyCar race of the season, trying to win the event and earn a $5 million bonus that was part of a league promotion for drivers who didn't compete full-time in the series this year.
He was the only driver to accept the challenge. This year's Indy 500 was the second time Wheldon had won the prestigious event. He also won it in 2005 and won16 times overall in his IndyCar career
Wheldon was expected to replace Danica Patrick next season in the Go-Daddy-sponsored car for Andretti Autosport. Patrick is moving to NASCAR full-time in 2012.
Wheldon was airlifted from the Las Vegas track at 1:19 p.m. local time Sunday and taken to a nearby hospital, becoming the first IndyCar driver to die on the track since rookie Paul Dana was killed in practice on the morning of race day at Homestead-Miami Speedway in 2006.
As word began to spread that his injuries were fatal, those at the track could not control their tears. Television cameras captured Ashley Judd, the wife of IndyCar champion Dario Franchitti, dabbing at her eyes shortly before the official word came.
The remainder of the race was canceled. Drivers solemnly returned to the track for the five-lap tribute, almost all of them hiding their eyes behind dark sunglasses after being told their colleague was gone. As Roger Penske met with his team trackside and other drivers simply hugged those around them, Bernard made the announcement of Wheldon's death.
"Our thoughts and prayers are with his family today," Bernard said.
When drivers returned to the track, Wheldon's No. 77 was the only one on the towering scoreboard. Franchitti sobbed uncontrollably as he got back into his car for the tribute laps. Over speakers at the track, the song "Danny Boy" blared, followed by "Amazing Grace" as hundreds of crew workers from each team stood solemnly.
The race was only minutes old when Wheldon was one of 15 cars involved in the wreck that started when two cars touched tires.
Several cars burst into flames, and debris was all over the track, some of the impact so intense that workers needed to patch holes in the asphalt.
Video replays showed Wheldon's car turning over as it airborne and sailed into what's called the "catch fence," which sits over the SAFER barrier that's designed to give a bit when cars make contact. Rescue workers were at Wheldon's car quickly, some furiously waving for more help to get to the scene. Bernard said Wheldon's injuries were "unsurvivable."
Wheldon's first Indianapolis 500 victory was in 2005 -- he passed Patrick with less than 10 laps to go that year -- and his win at the sport's most famed race this year was one to particularly savor.
It came in perhaps the oddest of fashions, as he was the beneficiary of a huge gaffe by someone else.
Wheldon was in second place, far back of rookie J.R. Hildebrand approaching the final turn when Hildebrand lost control and clipped the wall. Wheldon zipped past, and the only lap he led all day at Indianapolis was the last one. He returned to the track the next morning for the traditional photo session with the winner, kissing the bricks as his 2-year-old son Sebastian sat on the asphalt alongside him, and wife, Susie, held their then-2-month-old, Oliver.
Wheldon was almost resigned to finishing second at Indy for the third straight year, before misfortune struck Hildebrand.
"It's obviously unfortunate, but that's Indianapolis," Wheldon said. "That's why it's the greatest spectacle in racing. You never know what's going to happen."
Such was the case again Sunday.
Wheldon was well behind the first wave of cars that got into trouble on the fateful lap, and had no way to avoid the wrecks in front of him. There was no time to brake or steer out of trouble.
"I saw two cars touch each other up in front of me and then I tried to slow down, couldn't slow down," driver Paul Tracy said. "Then Dan's car, from what I saw in the videos, came over my back wheel and over top of me. Just a horrendous accident."
Even as a former series champion and one of the sport's top names, Wheldon did not have the financial backing to secure a full-time ride for himself this season. He kept himself busy by working as a commentator for some races and testing prototype cars that the IndyCar series will be using in the future.
IndyCar will have new cars in 2012, much of the changes done with a nod for safety. It had been a passion of Wheldon's in recent months, and he once quipped that he was a "test dummy" for the new cars by working with engineers as often as he was.
Wheldon began driving go-karts as a 4-year-old, and racing stayed with him as he attended school in England as a child, winning eight British national titles along the way. He moved to the United States in 1999, quickly trying to find sponsor money to fund his dream, and by 2002 -- after stints in some lower-profile open-wheel series, such as the F2000 championship, Toyota Atlantic Series and IndyLights -- he was on the IndyCar grid for the first time.
Wheldon was a fast study. He got his first IndyCar Series ride, in 2002, for two races with Panther Racing, then replaced Michael Andretti when Andretti retired the next season and won Rookie of the Year.
His first victory came the next season, in Japan, and he finished second in the championship standings behind Andretti Green Racing teammate Tony Kanaan. The next year, he was its champion. NASCAR teams talked to him about changing series. So did Formula One organizations.
In the end, he decided IndyCar was his calling.
"The biggest thing for me is the Indianapolis 500," Wheldon said in 2005, not long after becoming the first Englishman since Graham Hill in 1966 to prevail at the Brickyard. "It would be really difficult to leave this series because of that race."
As evidenced by the difficulty in finding sponsorships this season, it was also difficult for him to stay in the series. Even though he finished among the top 10 in IndyCar points annually from 2004 through 2010, Sunday was only Wheldon's third start of 2011.
Off the track, Wheldon had varied interests, some of which had almost nothing to do with his driving.
In 2010, he released a photo book he called "Lionheart," a coffee table book that he described as "almost like a photo biography from my career in IndyCars up until this point." He spent years editing the book, which included dozens of photos of his life away from the track, including images from his wedding.
"I wanted it to have a lot of my input," Wheldon said last year. "Obviously, it's a reflection of me."
He also wanted that book to provide his fans with a glimpse of his life that they would never have known otherwise.
"There's a lot of my wedding in there," Wheldon said. "I wanted there to be a lot of photos of my wife. She was the most beautiful bride on her wedding day the world had ever seen."
