An origin in the 80s says that he was drunk, fell over board, woke up on an island, six months later some hippies show up to collect those pot harvest, and he takes their boat.
Since then things got darker.
TOTALWAR with a heroin cartel for control of the island written by Andie Diggle a couple years back... hey? Isn't the bodyguard calling himself Diggle? But that book has been rebooted at least three times since then.