Nebelish, a male Human Jedi Knight, was a member of the Jedi Order and fought for them during the era of the Jedi Civil War. Meetra Surik discovered his dead body within the Tomb of Ludo Kressh on the planet Korriban in the year 3951 BBY. A datapad that had once belonged to a deceased Jedi was found on his person. It was learned that he had lost his mind and murdered some Jedi who were with him studying the tomb.
Interestingly, the polygon model that represents Nebelish's corpse is the same one that was used for Dustil Onasi in Star Wars: Knights of the Old Republic. The reason for this is that Dustil was originally intended to be in the sequel, but those scenes were removed, which meant that only the model remained within the game's files.
The body of Nebelish is identified as Dead Jedi, and his identity is only revealed through the datapad found on his body.