This individual has no known canonical name.  While the information presented is canonical, the individual described lacks an official name, thus the title is conjecture.

Mr. Black was an NID agent in charge of security at the safehouse where Adrian Conrad's Goa'uld resided. After noticing a breach, he attempted to investigate, only to be knocked unconscious after being shot with a Zat'nik'tel that was being wielded by Harold Maybourne. (SG1: "48 Hours")