The Zodiac Killer was a North California serial killer during the late 1960’s and early 1970’s. The Zodiac Killer has 5 confirmed murders and claimed to have committed 37 killings in total. During the time of the murders, the killer was corresponding to local law enforcement and media through cryptic letters. He would sign all of letters with the symbol to the left. Each letter would contain an ever increasing score, i.e. “zodiac=17 SFPD=0.” Arthur Leigh Allen was the only suspect in the killings, but he was never charged. Fingerprints that were left from the Zodiac Killer didn’t match those of Allen’s. Despite this, 22 years after one of the murders a witness picked Allen’s photo out of a lineup as the shooter. Allen died from kidney failure due to diabetes in 1992.