In the 70s, as it was happening, a lot of us probably thought, gee, there's a lot going on.

But looking back at a decade of violence, it was just crazy. It was crazy time.

Most serial killers don't make any effort to involve media or investigators.

They're very secretive. They don't want attention.

They almost want their crimes to go unnoticed but the idea of

committing a crime and then calling up the police and bragging about it that's a whole

another level of terror a man who wore a medieval style executioner's hood.

Who has baffled the police and baffled the media.

He seems to crave publicity.

He sent letters and cryptograms to newspapers and the police.

Subject stated, I want to report a murder.

No, a double murder.

I did it.

Here we are 50 years after the first zodiac killing.

In today's world of forensics,

old cases are being solved.

We're talking about probably the most famous cold case

in the last century or so in terms of

it's drama and being unsolved.

Who doesn't want to know how it turns out?

Dear editor, this is the Zodiac speaking.

If you do not print the cipher, by the afternoon of Friday, 1st of August,

...