Dubbed "The Railroad Killer," a man hops trains to his victims' homes, bludgeoning them, helping himself to their food — and evading police for years.

A deadly bomb explodes at the 1996 Olympic Games in Atlanta. But as FBI agents investigate subsequent attacks, they realize they've also become targets.

In 2002, a sniper shoots six victims in a Washington suburb, linking him to a spree that resulted in one of the largest manhunts in American history.