Resno, along with Janley, was one of Lesterson's assistants on Vulcan.
While he was working with Lesterson and Janley on reactivating one of the Daleks, Resno became very anxious and perturbed, claiming the Dalek was watching him. Lesterson noticed this, but was very dismissive about it and ordered Resno to continue with his work. Then, the Dalek shot and killed him.
Janley later had his body dumped in the mercury swamp and told Lesterson that Resno was only injured and resting at the colony hospital. (TV: The Power of the Daleks)