After a disastrous run-in with Robert Patrick Modell, the F.B.I. requests assistance from Agents Scully and Mulder to apprehend the criminal. Unbeknownst to the pair, however, Modell, also known as Pusher, has the overwhelming psychic ability to impose his will upon others. Luring Mulder into a Russian Roulette standoff, Modell convinces Fox to shoot him. Pusher later recovers from his near fatal head injury and escapes from imprisonment. Believing that a new rash of murders are Modell's attempts to wreak vengeance, Mulder tries to find Modell. In this set of crimes however, Pusher is innocent and protecting someone with similar powers. Modell is euthanized by the new "Pusher" when he is "convinced" that his heart stops.
Date of Death: Unknown
Eps: "Pusher" (3X17), "Kitsunegari" (5X08)

Mr. X assumed Deep Throat's former role as Mulder's inside informant and "seemingly" assisted Agent Mulder in many cases. Following a leak of information... the Cigarette Smoking Man, sets a trap at Mulder's apartment and assassinates his errant protege'. However, the mysterious Mr. X is able to leave a final parting message to Mulder, directing him to request assistance from Marita Covarubbias.
Date of Death: Unknown
Episodes: various

Mulder becomes convinced that voodoo rituals are responsible for the alleged suicides of two Marines in Folkstone, North Carolina. Following leads back to the local immigration processing center run by Colonel Wharton, Dana and Fox uncover a Haitian community in holding. Questioning the refugees, the agents discover that Wharton has been chastising the Haitians in order to gain the secrets of voodoo for his own evil purposes, including the murder of the Marine victims. Wharton utilizes his dark powers to assassinate Mulder and Scully, but the intervention of Pierre Bauvais and Chester Bonaparte, from the grave, eliminates the evil Colonel.
Date of Death: Unknown
Eps: "Fresh Bones" (2X15)

A kidnapping brings Agent Scully and Mulder to Traverse City, Michigan, to investigate. Mulder discovers a series of photographs at the scene which depict the victim in states of terror. Believing the kidnapper to have the latent ability to influence undeveloped film with his mind, Fox returns to Washington to have the photos analyzed. Meanwhile, Scully traces the crimes to a construction foreman, Gerald Schnauz, whom was at the scene of each abduction. Claiming to be freeing the women from the "howlers", Schnauz admits to the crimes. Schnauz is able to escape from imprisonment and abduct Agent Scully, intending to free her of "unrest". Mulder utilizes a psychic photograph of Scully to rescue her and shoot Schnauz.
Date of Death: October 1996
Eps: "Unruhe" (4X02)

Three brutal murders, in which the victims' livers were extracted, have occurred with no evident point of entry possible. Agent Mulder, seeking to assist Scully, reviews the scene and discovers evidence which indicates that this case is actually an X-File originating in 1933. Mulder later suspects that Eugene Victor Tooms, an unassuming Animal Control Officer, is the lead suspect. Unable to convict Tooms of the murders, Tooms is free to stalk his final victim following his release from a psychiatric hospital. Unfortunately for Mulder, Tooms has a personal vendetta against him which he wants to settle first. Tooms meets his end by being stretched by public conveyance.
Date of Death: Unknown
Eps: "Squeeze" (1X02), "Tooms" (1X20)

A high powered member of the Syndicate with a seemingly private agenda. The Well Manicured Man has seen fit to interfere with the plans of many secret operations by providing information to Agents Scully and Mulder. The Well Manicured Man was instrumental in returning Alex Krycek to the service of the Syndicate and the acquisition of the Russian Black Death serum. The mysterious official falls victim to a car bomb after warning Agent Mulder of the secret behind the Black Oil and the location of an underground government facility in the Antarctic.
Date of Death: Unknown
Eps: Various... FIGHT THE FUTURE