These mistakes proved costly. Welcome to WatchMojo, and today we’re counting down our picks for the biggest mistakes that damaged the investigations into unsolved cases. Our countdown of mistakes in unsolved mysteries that hindered investigations includes the Jack the Ripper Case, the Sydney Ghost Train Fire, the Zodiac Killer Case, and more! Do you know of another bungled investigation into an unsolved mystery? Let us know in the comments.

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#SerialKiller
#Killer
#Murderer
#Unexplained