The Zodiac Killer is one of the great unsolved serial killer mysteries of all time. He operated in North California in the late 60s, and wrote to newspapers claiming he had killed 37.
Even though police investigated 2,500 suspects, the case was never solved as forensic technology was not advanced enough to tie anyone conclusively to the crime.
But now a new team are examining the evidence and there is a high hopes that cutting edge forensic technology may finally blow open a case which has puzzled detectives for decades.
In a spree of heinous attacks the killer sent 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 greatest minds in cryptology for nearly 50 years—and it continues to draw scrutiny because the Zodiac killer claimed this code contained his real name.