Sifo-Dyas was a Master in the Jedi Order who was killed shortly after the Battle of Naboo. friend of Jedi Master Dooku, who shared his belief that the Jedi Order was not what it once was and that it shamed itself by serving a corrupt Senate. Dooku, upon beginning his training as Sith Lord Darth Tyranus, was told by his master Darth Sidious that Dyas had placed the order for the Clone Army in secret. Dooku was ordered to murder him and erase Kamino from the Jedi Archives before permanently leaving the Jedi Order. Dooku later presented Sifo-Dyas' lightsaber to General Grievous as a gift. Several years past and Sifo was rebuilt by General Grievous. Now he's half jedi, half droid and all evil.
PS rendering using Oded Fehr photo
PS rendering using Oded Fehr photo