IndyCar driver Justin Wilson died on Monday after suffering a severe head injury during a crash in the final laps of Sunday's race at Poncono Raceway in Pennsylvania, IndyCar officials said. The British driver was 37 years old.
Wilson, a former Formula One driver and seven-time winner in IndyCar racing, had been in critical condition in a coma at a hospital in Allentown, Pennsylvania, before his death.
"This is a monumentally sad day for IndyCar and the motorsports community as a whole," Mark Miles, chief executive officer of Hulman & Co, the parent of IndyCar and Indianapolis Motor Speedway, said in a statement.
"Justin's elite ability to drive a race car was matched by his unwavering kindness, character and humility -- which is what made him one of the most respected members of the paddock," Miles added.
Wilson's family said in a statement that he was a "loving father and devoted husband, as well as a highly competitive racing driver who was respected by his peers".
Wilson was the first IndyCar driver to die following a race accident since fellow Briton, Dan Wheldon, was killed in a fiery crash in Las Vegas in October 2011.
Wheldon, who died aged 33, was just one of two British drivers to win America's most famous race, the Indy 500, on more than one occasion. He won it in 2005 and again in 2011, the 100th anniversary of the race.
"We are deeply saddened by the passing of Justin Wilson," Wilson's Andretti Autosport team said in a statement.
"He was a tremendous racer, a valuable member of the team and respected representative to our sport.
"His life and racing career is a story of class and passion surpassed by none. Our thoughts and prayers remain with the Wilson family and fans worldwide."
Tributes to Wilson, who is survived by his wife and two daughters, poured in from his fellow drivers and others in the motor racing world.
New Zealander Scott Dixon, who won the Indy 500 in 2008 from pole position, tweeted: "Father, Husband, Friend, just an amazing human being. We will miss you to no end. Love to the Wilson Family. #RIPJustin".
Brazilian Tony Kanaan, winner of the 2013 Indy 500, posted on Twitter: "Why do we do this? Because we love it, don't want to be anywhere else but a race car. We will keep your legacy my friend. Racers race."
Hit by debris
Wilson's car had careened out of control and into a wall after he was hit by a large piece of debris from the car of Sage Karam at Pocono Raceway in Long Pond, Pennsylvania.
Karam, 20, was leading the penultimate race in the IndyCar Series when his car spun out on lap 179 of the 200-lap race, and smacked the outside wall, sending pieces of the car airborne.
He was taken to the same hospital as Wilson with heel and wrist injuries but was released on Sunday.
Karam will be re-evaluated before being cleared to drive, IndyCar officials said.
"I can't find the proper words to describe the pain and sympathy I feel for Justin and his family," Karam said in a statement on Twitter, followed by the hashtag #RIPJustin.
Wilson's accident was reminiscent of a 2009 incident when Brazil's Felipe Massa was struck in the helmet by a spring from Rubens Barichello's car during qualifying for the Hungarian Grand Prix and had to undergo surgery.
However, the Briton's death will once again raise questions about driver safety in IndyCar.
Since 1966 there have been 18 deaths in IndyCar (which includes the series' previous incarnations as Champ Car, CART and Indy Racing League). Eight alone have come at the famed Indianapolis Motor Speedway and all but two on ovals.
"I think IndyCar has been at the head of the (safety) curve," American motor racing legend Mario Andretti told Reuters last year. "There is not a sanctioning body more concerned with safety than IndyCar.
"But on an oval you have the speed, Formula One doesn't come close to those type of speeds and then you have cars side-by-side at 230mph.
"In a nutshell, IndyCar is definitely more dangerous because of the ovals so they are dealing with a totally different monster."