"I like to kill, it is very funny," said his first message. Now another secret of the 'Zodiac Killer' is known

A message in a mysterious unknown code written by the criminal nicknamed 

the Zodiac Killer

was solved this Friday after a 51-year mystery thanks to a team of experts from the United States, Australia and Belgium, according to The San Francisco Chronicle newspaper.

The FBI confirmed to be aware of the discovery 

in a statement on the social network Twitter.

According to the federal agency, “the case remains an ongoing investigation.” “Although decades have passed, we continue to seek justice for the victims of these brutal crimes.

Due to the ongoing nature of the investigation and out of respect for the victims and their families, we will not provide further comment at this time, "he added.

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Five people were stabbed or shot to death in Northern California in 1968 and 1969, and for years their suspected killer sent letters and cryptograms mocking police and the press.

He was never caught.

He was nicknamed 

the Zodiac Killer

because some of his cryptograms included astrological references and symbols.

The text decoded this Friday, as reported by the San Francisco Chronicle, says: "I hope you are having a lot of fun trying to catch me ... I am not afraid of the gas chamber because it will send me to paradise much sooner, because I already have enough slaves to work for me. "

Investigators hoped that the secret message would reveal the identity of the killer, but it did not.

This is the second time a

Zodiac Killer

code has been cracked

.

The first, a lengthy message sent in chunks to The San Francisco Chronicle, San Francisco Examiner and Vallejo newspapers in 1969,

was solved by a Salinas, California school teacher and his wife.

He said, "I like to kill because it's so much fun."

Betty Lou Jensen, David Faraday and Darlene Ferrin, allegedly victims of the Zodiac Killer, in October 1969 photos.Bettmann Archive / Getty Images

The

Zodiac Killer

, who terrorized the San Francisco Bay area, shot dead two teenagers in December 1968 who had parked on a country road to kiss.

Six months later, he shot another couple.

Although one victim survived that attack, her account did not yield any definitive clues.

The criminal killed seven more people until October 1969.

Authorities think he

may have also killed other lives years before and after the crimes attributed to him,

in areas like Napa, California.

Although he was never caught, some investigators believe he was Arthur Leigh Allen, a convicted child molester who died in 1992. Other forensic experts have assumed that he might still be alive in California.

With information from The San Francisco Chronicle and NBC News.