Suvak

Suvak was a middle-aged Vulcan, an ambassador who was betrothed to Joanna McCoy in the year 2274.

History
Suvak was an ambassador to a planet in the sector which contained Hephaestus. He met Joanna McCoy during his eighth pon farr, mind-melded with her, and agreed to marry her. He had come to Hephaestus for a “rest cure,” and had officially hired Joanna as a private nurse, thinking he was suffering from some kind of virus. It turned out to be choriocytosis.

An underground facility manufactured intelligence-augmenting symbionts for the native Hephaestans. Klingon Commander Kagg knew this secret, and had planted a bomb in the facility. Kagg took Joanna McCoy as a hostage. Suvak used his mind meld to lead him to Joanna. He freed her and physically restrained Kagg while Joanna and a rescue party beamed away, moments before the bomb exploded, killing Suvak and Kagg.