Fonterrat
this alien scavenger gave Tionne the coordinates of Exis Station, during her search for Jedi lore during the early years of the New Republic. Many years later, Fonterrat located the Empire's storehouse of plagues, and was able to secure a sample of the Emperor's Plague. He sold the sample to Nolaa Tarkona, who had Fonterrat's payment tainted with the plague in order to test its effectiveness. Fonterrat didn't directly sell her the location of the storehouse, though. He provided this to Bornan Thul, who later disappeared with the datadisk. Fonterrat himself fled Tarkona to the planet Gammalin, where he began spending his tainted credits. When the human population started dying because of the plague, and discovered that Fonterrat was the source, they locked him in jail. He languished there, and eventually died when his human captors all died of the plague.