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Who is Tyler Hamilton?

Meet the cyclist who exposed the dirty world of illegal drug use in the sport of cycling on "60 Minutes"

In a sport recently dominated by Lance Armstrong, Tyler Hamilton still managed to make a name for himself as a world-class cyclist, tough competitor, and valued teammate. But outside the cycling community, how many people knew about Hamilton before now?

"60 Minutes Overtime" tells Hamilton's story: how an unlucky break introduced him to cycling, his relationship with Lance Armstrong while they were teammates on the legendary U.S. Postal Service team, and what Hamilton hopes his legacy will be in the riding world.

Tyler Hamilton says one day he'll be thanked for what he's revealed about the high-pressure culture of cheating in cycling. What do you think? Hero or villain?