The Hunt for the Zodiac Killer

About the Series

In the late 1960s and early 1970s, the Zodiac Killer, one of history’s most famous unidentified serial murderers, terrorized the San Francisco Bay area in a spree of heinous attacks, sending taunting letters to authorities, some containing ciphers filled with mystifying combinations of letters and symbols. One cipher in particular, known as the Z340, has baffled the greate ...

S1 E5

The Code is Cracked

Aired on Dec 12, 201743m

The Code Team announces extraordinary news: A team member has solved the Zodiac’s infamous Z340 code, which has eluded codebreakers for 50 years.

S1 E4

The Secret FBI Files

Aired on Dec 05, 201742m

The FBI releases secret files and a handwriting analyst connects the Zodiac’s letters to a taunting letter mailed 3,000 miles away in Albany, NY. The code team has a massive breakthrough on the Z-340.

S1 E3

A New Code Uncovered

Aired on Nov 28, 201743m

A new cipher is uncovered, while the team’s supercomputer uncovers a strange lunar pattern linking the killings. A taunting riddle by the killer may lead to a body. A second prime suspect emerges.

S1 E2

The Military Connection

Aired on Nov 21, 201742m

Did the Zodiac Killer serve in the U.S. Armed Forces? The team’s supercomputer identifies strange symbols in the killer’s code that would have been known to only a few when it was written.

S1 E1

The New Suspect

Aired on Nov 14, 201741m

A new hunt for the Zodiac Killer gains unprecedented access to files, unearthing a complicated cypher that may contain the killer’s name, and links between the killer and an unsolved case.