Jeffrey Frank Spender was a procurer and seller of high level intelligence, and former Agent in the FBI. The son of Cigarette Smoking Man and half brother of Fox Mulder, Spender was shot in the face by his father and was subsequently subjected to torturous tests at his behest following Spender's betrayal before the death of the Syndicate.
Spender escaped FBI Protective Custody and began selling information to high bidders. He evaded capture by the FBI only to contact Mulder with information regarding the List killings. After discovering an attempt by the New Consortium to engineer an exchange with the Colonists in Northern Russia, he again contacted Mulder and Scully. He was killed by Grey Haired Man after explaining his actions.