Shea Sadashassa served as a senator for Herdessa within the Galactic Senate of the Galactic Republic, and was a member of the Delegation of 2,000. Following the formation of the Galactic Empire by a single day, Imperial Intelligence initiated a mass arrest targeting senators, and Sadashassa was among those apprehended. Despite this, Sadashassa remained a member of the Imperial Senate, all the while secretly aiding the Alliance to Restore the Republic as a rebel collaborator. Later, Sadashassa, along with other sympathizers, was imprisoned in the Arrth-Eno Prison Complex, where Sadashassa was killed during the Arrth-Eno Mission after Emperor Palpatine discovered the mission and set a trap.