Thirteen people were randomly shot across Washington D.C. — in just three weeks — back in October 2002. As each new victim was gunned down, the FBI and local detectives struggled to track down a killer — until a tip helped them piece together the murder mystery. Journalist Tony Holt hosts the 10-part series, "Chasing Ghosts: The Hunt for the D.C. Snipers," which takes a magnifying look at one of the most devastating killing sprees in U.S. history.