The last of four Enterprise security men to die on Gamma Trianguli VI in 2267, clubbed from behind when the People of Vaal are ordered to kill the landing party.
Marple appears in the second-season episode The Apple. By the time the landing party reaches the village of the People of Vaal he is the only security guard left alive, his colleagues Hendorff, Kaplan and Mallory having been killed by the planet's defences.
The villagers are gentle and have no idea of violence until Vaal, alarmed by the strangers, instructs Akuta to have them killed and shows him how to strike with a heavy club. In the attack that follows, Marple is hit on the head from behind and dies at once.
The rest of the party overpower the villagers easily, since they have never fought before. Marple was played by Jerry Daniels.