Malerk

Malerk was a former sith apprentice of Darth Sidious. In 33 BBY, he was betrayed and killed by Sidious. 15 years later, in 18 BBY, he was resurrected and sought to kill Palpatine. 18 years later, in 0 BBY, Malerk finally found Palpatine during the Assassination Attempt on Emperor Palpatine. They dueled and Malerk ended up dying.