Murder and mayhem! These deadly serial killers are two of history’s most notorious. It’s Jack the Ripper up against the Zodiac Killer.

These horrifying murderers shook the world and are some of the most well-known serial killers to true crime enthusiasts.

Will sadistic Jack the Ripper slay his competitor with his precise cut and hunger for homicide?

Or will the cryptic Zodiac Killer confuse and calculate his way to the top?

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By Underknown, the creators of What If. underknown.com