Some top drivers from NASCAR and other forms of auto racing who have died in on-track incidents.
ARCA racing driver Blaise Alexander celebrates after winning the ARCA Pepsi 200 race at Pocono International Raceway in Long Pond, Pa., in 1999. Alexander, who also competed in the NASCAR Nationwide Series, died of head injuries suffered in a crash during the final laps of the EasyCare 100 ARCA race at Charlotte Motor Speedway in Concord, N.C. in 2001.
NASCAR driver John Nemechek, center, stands next to older brother Joe Nemechek with their mom, Martha Nemechek, in the foreground. John Nemechek died as a result of injuries suffered in a NASCAR Truck Series race in Homestead, Florida in 1997.
Danish Driver Allan Simonsen's car exited the track at high speed during the 24 Hours of Le Mans in 2013. Simonsen died as a result of his injuries.
NASCAR Modified driver Richie Evans was killed during a practice crash at Martinsville Speedway in 1985.
IndyCar driver Tony Renna died in 2003 after crashing during a test drive at Indianapolis Motor Speedway.
IndyCar driver Scott Brayton died from injuries suffered during a turn-two practice crash at Indianapolis Motor Speedway in 1996. Brayton had earlier won the poll for the Indianapolis 500.
American Formula 1 racer Mark Donohue died after an accident in practice for the 1975 Austrian Grand Prix.
NASCAR driver Glenn "Fireball" Roberts was killed as a result of injuries suffered during a wreck while competing in the World 600 at Charlotte Motor Speedway in 1964.
NASCAR driver Tiny Lund died as a result of injuries suffered during a wreck at Talledega Superspeedway in Alabama in 1975.
NASCAR driver Kenny Irwin Jr. died during a practice session at New Hampshire Motor Speedway in 2000.
NASCAR driver Jason Leffler died after an accident in a heat race at a dirt car event at Bridgeport Speedway in Swedesboro, N.J. on June 12, 2013.
NASCAR driver Neil Bonnett died after a crash during Daytona 500 practice in 1994.
Three-time Formula 1 world champion Ayrton Senna died after crashing on the seventh lap of the San Marino Grand Prix in Imola in 1994.
Adam Petty, grandson of legendary NASCAR driver Richard Petty, died following a wreck during a test session at New Hampshire Motor Speedway in 2000.
IndyCar driver Paul Dana died as a result of a practice lap crash at Homestead-Miami Speedway in Florida in 2006.
Formula 1 driver Gilles Villeneuve was killed in practice for the Belgian Grand Prix in 1982
Indy car driver Greg Moore was killed in a single-car wreck at Auto Club Speedway in California in 1999.
Dan Wheldon, who moved to the United States from his native England, died on Oct. 16, 2011 after a massive, fiery wreck at the Las Vegas Indy 300.
Mourners look at photos and racing memorabilia after the funeral of NASCAR driver Tony Roper in Fair Grove, Mo., on Wednesday, Oct. 18, 2000. Roper, 35, died the previous week of injuries suffered Friday night when he crashed into a wall at Texas Motor Speedway in Fort Worth, Texas.
Known to race fans as the 'Intimidator', Dale Earnhardt Sr. died following a crash on the final lap of the 2001 Daytona 500.