If you believe Robert Tarbox, the Zodiac killer was a merchant marine. According to Tarbox, now 82, in the early 1970s a man came into his office stating that he was a merchant marine and that he was responsible for the Zodiac killings. He asked what the consequences would be if he turned himself in. Tarbox told him the outcome would not be good, that he could receive the death penalty or at best life imprisonment. The man left the office and was never seen again. Tarbox never told anyone about this until now, client privilege and all that being in play.
Over the years many names have cropped up as the possible Zodiac killer but none have panned out. The most recent, Arthur Leigh Allen, went all the way to DNA testing before his involvement in the killings was ruled out. The zodiac remains one of the great mysteries in criminal history.