In 2379, Dietz was responsible for monitoring the Federation's situation with Tezwa which included listening in on conversations between Federation President Min Zife and a group of Starfleet admirals giving orders to Captain Jean-Luc Picard and to conversations between Presidential Chief of Staff Koll Azernal and Bilok, the Deputy Prime Minister of Tezwa. He also carefully monitored the movements of Nelino Quafina.
Under orders from his supervisor L'Haan, towards whom he harbored romantic interest, Dietz was prepared to destroy the entire planet of Tezwa if the USS Enterprise-E failed in its mission. Although L'Haan and he shared similar opinions on policy and was not squeamish about destroying planets, he disliked such heavy-handed methods, preferring subtlety. Carrying out this order became unnecessary when Worf was able to obtain the Fleet Command codes which allowed the Enterprise to take control of the entire Klingon fleet. (TNG novel: A Time to Kill)
Along with his fellow operatives, Dietz continued to monitor the actions of Azernal and Quafina, including their hiring of the merchant freighter Caedera. He was responsible for activating the Orion Sleeper. Once Zife's illegal actions were known to a select group of Starfleet admirals who forced him to resign, he, along with Vasily Zeitsev and L'Haan, was responsible for escorting Zife to give his resignation, and then executing Zife, Azernal, and Quafina. (TNG novel: A Time to Heal)
|Known members and associates of Section 31|
|Primary universe||Olivia Akomo • Caliq Azura • Julian Bashir • Lance Cartwright • Cole • Control • Dietz • Matthew Dougherty • Sarina Douglas • Franklin Drake • Enderby • Darwyn Friel • Matthew Harris • Jedburgh • Karim • Bendes Kettaract • Ken Kitsom • Ko Ji-hoon • Jhun Kulkarno • L'Haan • Peter Lawrence • Lee • Ethan Locken • Roberta Luke • Merra • Erovan M'Rill • Olim Parra • Tinh Hoc Phuong • Erik Pressman • Ramirez • Parvati Rao • Malcolm Reed • Tomas Roeder • William Ross • Connaught Rossa • Sakonna • Luther Sloan • Eric Stillwell • Aubin Tabor • Malla Tancreda • Kestellenar th'Teshinaal • Charles Tucker III • David Webb • Marcus Williams • Vasily Zeitsev • Cortin Zweller||31|
|Kelvin timeline||Thomas Harewood • John Harrison • Robert April • Alexander Marcus • Yuki Sulu • unnamed Section 31 personnel|