In Crossing the Styx, Sal Gravina refers to him as a "headhunter".
Charon, in Greek mythology, is the ferryman of the dead. His job is to take the souls across to the underworld. He will only take those who can pay for their passage, which is why a coin, called an Obol, was placed on the lips of the deceased when buried.
Crossing the Styx is a mythological phrase which means crossing over from the world of the living to the world of the dead. The Styx is a river which is said to wrap around Hades (also called Hell) nine times.