Marco Simoncelli was killed after being involved in a horrific crash in the MotoGP race at Sepang, Malaysia.

 after horrific crash

The Italian lost the front end of his bike on the second lap of the race and fell to his right, with the bike's wheels continuing to grip and throwing him into the path of Colin Edwards and Valentino Rossi.
Both riders appeared to hit Simoncelli, whose helmet came off during the incident.
The race was red flagged immediately, and cancelled a few minutes later when it emerged that Simoncelli was in a critical condition.
Honda rider Simoncelli was in his second season in MotoGP, and established himself as a fan favourite with his flamboyant riding style.
He took his maiden podium spot in the series in the Czech Republic two months ago, and followed that up with a second place finish at the recent Australian Grand Prix.
Simoncelli's death is the second casualty in the top level of motorsport, coming just a week after British driver Dan Wheldon was killed in an IndyCar race in Las Vegas.
Eurosport