Time Lord
Hedin was a high-ranking and respected Time Lord politician who was said to have been a good friend of the Doctor before he left Gallifrey. In fact, Hedin was in league with the renegade and powerful Time Lord Omega because he believed Omega deserved freedom and recognition for his achievements, and contribution to Time Lord history. The Doctor knew this was a mistake and tried to reason with Hedin, who was suddenly killed by saving the Doctor's life from a shot fired by one of the Castellan's guards.