Rei was a Nagai sentry stationed at Lumiya's, the Dark Lady, headquarters along with Mendo and Taru on Kinooine. This occurred in the beginning stages of the Nagai invasion of the galaxy. While they were standing guard in 4 ABY, Kiro, an infiltrator from the Alliance of Free Planets, killed Mendo as he tried to free Luke Skywalker, who was being held prisoner. Rei and Taru went looking for their lost friend, but they were ambushed and met their ends.