Halla Ettyk was a Human female New Republic commander and criminal prosecutor from Alderaan who fought against the Galactic Empire during the Galactic Civil War. She survived the Death Star's destruction of her homeworld by being off-planet trying to depose a witness. The loss of the peaceful planet helped motivate her to join the Alliance soon afterward.
Ettyk rose through General Airen Cracken's intelligence organizations to the rank of Commander. Circa 7 ABY, Ettyk was working on the recently liberated capital planet Coruscant and took up the offered job of prosecutor on behalf of the New Republic Armed Forces in the trial of Rogue Squadron executive officer Tycho Celchu.
The commander presented seemingly overwhelming evidence that Captain Celchu was guilty of the murder of fellow Rogue Corran Horn, and of treason against the new government. The politically-motivated case, which was being used by the government to show they could be as hard on Human criminals as they could on aliens in the face of the Krytos virus, seemed almost impossible for defense attorney Flight officer Nawara Ven to win, even with Ettyk using mostly circumstantial evidence.
Ettyk, however, dropped the charges when Horn escaped from the Imperial prison Lusankya and Cracken revealed his own knowledge of Celchu's innocence.
Despite having not prosecuted a case in seven years, Ettyk proved to be a formidable lawyer. She felt that she could win the case even by using mere circumstantial evidence to prove Celchu's guilt, a testament to her legal skills
- The Complete Star Wars Encyclopedia