You've Killed My Son (The Search for Spock)

Both David Marcus and Lieutenant Saavik speak to Admiral Kirk, who is on the USS Enterprise, by communicator and Saavik reveals that Spock is with them, alive. David says that he can't believe that Kruge would kill them for Genesis, since the project was a failure. Kruge challenges that by ordering his men on the surface to kill any one of the prisoners. One of the men stalks behind the USS Grissom prisoners with his d'k tahg knife unsheathed. He chooses Saavik. However, as he rears back to sink the blade into the Vulcan's back, David jumps backward and attacks the Klingon. Thoroughly outmatched physically, David is knocked down and stabbed through the heart, while both Spock and Saavik can only watch and do nothing. With the communicator forced in her face, Saavik simply intones, "Admiral, David is dead." Completely devastated, Kirk stumbles back and falls to the deck, cursing the Klingons for the needless death of his only son.