My mind, once I start on something, Chris, it's hard to stop. Puzzles are what stimulates my mind,

and I like tackling them. You know, my understanding was the Z-13 was impossible.

I'm talking to a man named Alex Baber about the Zodiac killings of the late 1960s, and the taunting

cryptograms the killer sent to police and newspapers. The killer claimed to have

killed more than 30 people. Some of the cryptograms were relatively easy to crack, but did not help

solve the case. The toughest to decipher and the most tantalizing was the letter he sent to the San Francisco

Chronicle in April 1970. the killer seemed to be answering

a public challenge posed by the head of the American Cryptogram Association, who had dared

him to put his real name in a code. In this letter, the Zodiac wrote the words,

My Name Is, followed by a 13-character string of letters and symbols.

It came to be called the Z-13 cipher, and one thing that made it so hard to break was its brevity.

It stymied generations of PhDs and puzzle masters.

It became the ultimate prize in Zodiac studies because it promised to reveal the

killer's identity. Enter Alex Baiber. What possible solutions or names can we generate from that?

So with the help of AI and C++ computing and progressions, I was able to eliminate 93, almost 94% of the field just on the

fact that the combinations of names did not correlate with a real-world individual.

Weber is 50 years old, a West Virginia man and the founder of Cold Case Consultants of America,

which is funded by victim advocate investors and money he inherited.

He'd been interested in the Zodiac case in seeing David Fincher's film Zodiac in 2007.

The film was based on former newspaper cartoonist Robert Graysmith's book of the same name,

which focused on a man named Arthur Lee Allen as the suspect.

Alan was a Navy veteran and an elementary school teacher in a Tascadero, who was arrested

...