Stex

General Stex was a Klingon adviser in the late-23rd century.

In 2293, Stex accompanied Chancellor Gorkon and his contingent in attending a formal dinner aboard the USS Enterprise (NCC-1701-A), which was escorting Kronos One to peace talks on Earth.

Later that evening, when a pair of assassins beamed aboard Kronos One, Stex was seriously wounded, losing his right arm in the attack, which also resulted in the death of Chancellor Gorkon.

Afterwards, Stex testified at the trial for James T. Kirk and Doctor Leonard McCoy. He then attended the Khitomer Conference with Azetbur, Gorkon's daughter, who had been elevated to the position of Chancellor in the wake of her father's death. 

Background information
General Stex was played by actor Brett Porter, his name was not spoken in the movie, but was mentioned in the call sheet and closing credits. In the script he was described as "one of President Gorkon's Guards".

According to special effects make-up artist and designer Richard Snell, "We did one blowaway arm on General Stex, and we had to make a casting of his arm and design a rig that blows off because he has his arm blown off. Interestingly, we did not have to rig it for blood. We ended up not making ant blood rigs for the stump that gets phasered off and goes blasting away. They're in zero gravity and the blood would float in the air in globules, [which] was an optical effect that ILM took care of." (Charting the Undiscovered Country: The Making of Trek VI, p. 59)

Stex Stex