Two Enterprise-A yeomen who beam aboard Kronos One in 2293 and shoot Chancellor Gorkon on behalf of the Khitomer conspirators, and are then silenced by Valeris.
Yeomen Burke and Samno appear in Star Trek VI: The Undiscovered Country. After the Enterprise seems to fire on Gorkon's flagship and its gravity fails, two figures in Starfleet pressure suits and magnetic boots transport aboard, shoot their way to the Chancellor and wound him fatally.
Spock's search of the Enterprise turns up traces of Klingon blood on the transporter pads and finally a set of stained uniforms. Before the two men can be questioned they are found dead in a corridor, each killed by a phaser set to stun and fired at close range.
Kirk and Spock turn the murders to account. An announcement that the yeomen are alive and ready to make statements draws their killer to sickbay, where Valeris finds Kirk and Spock waiting.