The Killer of Men was a criminal and multiple murderer until he was captured by mercenaries working for Antonia Chillingsworth. After his capture, he became one of Chillingsworth's frozen specimens kept on the Kublai Khan, labeled as a Furyan, saying "Furya" with the words "Killer Of Men" beneath the plaque. While on a tour of the ship, Riddick saw the Furyan and recognized the term, but did not know what it meant or where he remembered it from.
Along with Shirah, Riddick and The Purifier, he is one of the few Furyans to survive the infanticide that took place on Furya some thirty years in the past. He is presumably still on the Kublai Khan, although it is now without an unfrozen crew and is drifting through space.