Extreme kayaker Shannon Christy profiled by "60 Minutes Sports"
The Potomac River has some of the most extreme rapids that only expert kayakers can run. "60 Minutes Sports" correspondent David Martin recently followed Shannon Christy, a young kayaker, as she prepared to run the falls in a race. However, just two days before the competition, Christy died in a practice run. For more on this story, watch Martin's full report on the "60 Minutes Sports" on Showtime tonight.