Lieutenant Siro was a Gotal who served the Galactic Alliance Defense Fleet aboard the frigate Shamunaar in 40 ABY. In that year, the Shamunaar was visited by Galactic Alliance Admiral Matric Klauskin, who was being manipulated by the Sith Lady Lumiya. Klauskin brought the frigate's captain, Biurk, to the auxiliary bridge and placed Siro in charge of the main bridge. He then murdered Biurk and opened all of the Shamunaar's external hatches. Exposed to the vacuum of outer space, Siro and the rest of the crew were killed.