100
This killer is an unsolved and still open case that haunted Northern California starting in 1968. This bizarre case involved a series of letters sent to three California newspapers. In many, an anonymous man confessed to murders. Even more chilling were his threats that if the letters were not published, he would go on a murderous rampage. The letters continued through 1974. In total, the man, who went by this famous nickname, confessed to 37 murders.
Who is the Zodiac Killer?