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News of the letters was first reported Thursday by the Albany Times Union, which did not receive one. It is unclear what the letters say or which outlets got one.
Suspected Zodiac Gary Poste (right) is said to have let alleged apprentice Chris Avery (left) watch as he ordered another boy to shoot an enemy dead after luring the unidentified man to a remote lake near his home in Groveland, California.
The Case Breakers, an investigative group of 40 sleuths, believes they have unmasked the Zodiac killer as Gary Francis Poste after finding new evidence believed to be linked to the murders