Aymor

 was a specialist in time anomalies. When the Chancellor noticed something strange within the timelines, he was asked to take his squad to find out what was causing it and take it for the Time Lords. (AUDIO: One Life) He was after Quarren Maguire and crashed on the Theseus and died, having been shot by a regeneration inhibitor. (AUDIO: The Starship of Theseus)