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

In the '90s, a killer in New York selects his victims based on their birth signs. Can the cops catch him before he attacks all 12 symbols of the zodiac?

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.