An alien bounty hunter, Aris Boch is a member of a species that is biologically incapable of being taken as hosts by Goa'uld symbiotes. The Goa'uld enslaved his species and got them addicted to a drug called roshnah, to keep them subjugated. Because of this, Aris Boch has agreed to work for Goa'uld such as Sokar and capture his various opponents.
Boch admits that he hates the Goa'uld just as much as anyone else, but sees no means by which to fight them on a galactic scale. But he agreed to let SG-1 and a captured Tok'ra operative go free, though it would put his relationship with Sokar in jeopardy.
Since Sokar's destruction, Boch's fate is unknown.
Deadman Switch - SG-1 encounters bounty hunter Aris Boch, whose race is enslaved by the Goa'uld because their physiology rejects symbiotes. He is convinced to let them go free, rather than handing Teal'c or a Tok'ra over to Sokar.