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It may be difficult to imagine a time when the term serial killer wasn't a part of the zeitgeist. Our culture seems to be as fascinated with serial killers as it is terrified by them.

But in 1969, the idea of a murderer stalking and methodically killing victims seemed more like something out of a nightmare.

But then something unspeakable happened that summer in San Francisco.

A series of similar murders were initially viewed as unrelated violent events.

Until the letters started arriving.

On August 1st, 1969, the San Francisco Chronicle,

along with the San Francisco Examiner

and the Vallejo Times, each received variations

of a letter, all seemingly written by the same person.

Quote, Dear Editor,

This is the murderer of the two teenagers last Christmas at Lake Herman

and the girl on the 4th of July near the golf course in Vallejo.

To prove I killed them, I shall state some facts which only I and the police know.

The letters were accompanied by bizarre cryptograms, square puzzles made up of simple, seemingly

undecipifiable symbols.

...