TOKYO (AP) _ Japanese motorcyclist Daijiro Kato died Sunday morning after sustaining head, neck and chest injuries at the Grand Prix of Japan two weeks ago, the MotoGP said on its Web site.

The 26-year-old rider hit the wall with his Honda on the third lap of the season-opening race April 6. Kato, a former 250cc world champion, was in a coma when flown to the hospital by helicopter.

The 3.6-mile Suzuka track is considered one of the most dangerous in Grand Prix motorcycling.

Race organizers are not sure what caused the accident.