Dooku (free-edit)

Dooku was Palpatine's second apprentace. He lead the Confederation of Independant Systems and fought during the Clone Wars. He was killed by Anakin Skywalker during the Second Battle of Coruscant.

Dooku and Aanor
After the death of Darth Maul Dooku became Sidous' new minion. However, also in contention was the merraxen, Aanor. Dooku was seen as more powerful, but Sidous allowed Aanor to serve him as a Sith minion. Dooku and Aanor underwent a long rivalrey which Sidous played off of. He tested both warrior's powers and skills.

Death
Dooku dueled Anakin Skywalker and Obi-Wan Kenobi on the Invisable Hand. Dooku knocked out Obi-Wan, but as he went to duel Skywalker Republic soldior Dan Eardornn came in and stunned Anakin, trying to make the kill himself. However, Dooku defeated Eardornn but was exectued by Skywalker.