ge'Tvrona was a male al'Hmatti who worked in the topaline processing plant on planet taD under Kori in 2375. While Kori considered ge'Tvrona a colleague and friend, ge'Tvrona was secretly a member of the anti-Klingon rebellion, who conspired to bomb the topaline plant, and who himself killed Kori. (TNG novel: Diplomatic Implausibility)