Around the time of the Invasion of Naboo, Supreme Chancellor Finis Valorum requested Sifo-Dyas conduct clandestine negotiations with the Pyke Syndicate, and he headed for Oba Diah with Valorum's personal aide, Silman. However, the Sith Lord Darth Tyranus hired the Pykes to target Sifo-Dyas's T-6 shuttle, and they shot down his ship over the Oba Diah moon. Sifo-Dyas died in the resulting crash, but Silman survived and was taken prisoner by the Pykes. Consequently, Tyranus and his Sith Master, Darth Sidious, funded Sifo-Dyas's army of clone troopers, instructed the Kaminoan cloners to add Order 66 to the clones' inhibitor chips (which Sifo-Dyas originally intended to be a safeguard against any treacherous orders given to clones), and manipulated the Jedi Order into taking command of the army when the Clone Wars erupted. It was not until years later that the Jedi began to unravel the Sith's conspiracy and unearthed the details of Sifo-Dyas's demise.