R5-j2 was an R5 Astromech Droid used by the Galactic Empire during the near end of the Galactic Civil War. He was on the Second Death Star when both Darth Vader and Emperor Palpatine arrived on the Imperial Space Station to oversee the final stages of construction on the Death Star before releasing its power on the galaxy. J2 was used as an repair droid for the Death Star, along with many other droids but was destroyed when the Rebel Alliance's Navy attacked and destroyed the new space station.