Jero Kolfin

Jero Kolfin was a member of the True Jedi Alliance, and was one of the few to know the group's true purpose as Vrool Katare and Ouiga Vod's Sith cult. Jero gave in fully to the dark side of the Force, making him close to Katare and later his right-hand man after Ouiga's death in 36 ABY. He continued to be a leader until 46 ABY, when he was replaced by Toven Gane. Six years later he attempted to assassinate Toven for revenge, but failed and was killed.