Cahill was a Twi'lek male captain during the Cold War between the Galactic Republic and the reconstituted Sith Empire.


In 3643 BBY, Cahill was stationed on the planet Alderaan when he spotted Thul agents taking heavy equipment to an Organa weather tower. He wasn't sure what to do, so he tasked a Republic spacer to travel to Wardpost Hurne and report it to Captain Barra.