Koh, a male Human Imperial captain hailing from Raithal Academy, was a loyal supporter of Headmaster Gentis during Gentis' coup in 19 BBY. Furthermore, he possessed expertise in demolitions. During Palpatine's retaking of Coruscant, Gentis instructed Koh to use grenades against Vader and his newly formed forces. However, Shonn Volta, a former Confederacy sniper, intervened, shooting Koh before he could deploy the explosives. Consequently, the grenades detonated among the cadets.