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Previously on Jimmy Aiken's mysterious world.

Beginning in late 1968, a serial killer began terrorizing the San Francisco Bay Area.

He called himself the Zodiac. In addition to killing people

he carried on an extensive correspondence with various newspapers and individuals.

He sent taunting letters and cards that dared the police to catch him.

He issued threats that terrified the community, and he sent cryptograms that, when

decoded, described a bizarre set of beliefs.

This all made the Zodiac arguably the most famous solo serial killer in American history.

But what motivated him?

Why did he commit his bizarre crimes and who was the Zodiac?

The next incident took place on March 22, 1970.

A woman named Kathleen Johns was driving up to visit her mother from Southern California and she was

passing through Modesto about 90 minutes east of San Francisco.

Kathleen was a young mother. She had her infant daughter with her in the car, and she was also seven months pregnant

with her second child.

At about 11 p.m. she noticed a car behind her.

The driver was honking his horn and flashing his lights, trying to get her to pull over.

At first she didn't, but eventually she did, since she was driving an old car and thought the

other driver might be trying to warn her of a mechanical problem.

...