good morning, christine. it s mont, october 17th. ali is off, carol is on assignment, and i m alina cho. this car crash, our hearts go out to the family of dan wheldon. we ll speak to say the a lot of about this. heart broken fans and drivers this morning. the tragedy on the track. indycar champion dan wheldon died in one of the worst crashes the sport has ever seen yesterday in las vegas. indycar going into the off-season how fragile life can be and how dangerous their sport is. some of the images of the crash you ll see may be disturbing. reporter: the last race of the year, dan wheldon s car sailing through the air, slamming into the catch fence and disintegrated. oh, multiple cars involved. reporter: a horrific 15-car wreck. video showing cars spinning out of control, bursting into flames and shooting smoke and debris into the air. cars in flames, wreckage, carnage. terrible. they just crumpled and caught on fire and everybody gasped. reporter: racers got th