He did so by hiring Lom Pyke to shoot down Sifo-Dyas' ship. Dooku was using his Sith name before Darth Maul died and thus before he was Sidious' apprentice. This assassination was commissioned by ...
Star Wars' Days Of Future Past in Jedi Knights #1 from Marvel Comics by Marc Guggenheim and Madibek Musabekov (Spoilers) ...