Marcus Holt was a highly placed CTU operative working inside the Chinese government. Two months after agent Jack Bauer's abduction during Day 5, Holt was killed by unknown elements. District believed that Jack gave up Holt's identity during his interrogation by Cheng Zhi, and arrested Jack shortly after he returned to the United States to question him about Holt. Jack and Holt were good friends and partners for many years before Holt's death.