|Dates||???? - 2012 (killed by Dean Winchester)|
|Location||Coeur d'Alene, Idaho|
|Occupation|| Postal worker (formerly)|
|Episode(s)||7.15 Repo Man|
Jeffrey was a postal worker with psychopathic tendencies. Four years prior to 7.15 Repo Man, Jeffrey was possessed by a demon who allowed him to express his murderous desires. Like many psychopaths, Jeffrey is very gifted at feigning innocence and helplessness to lull people into a false sense of security around him. He uses this to separate Sam from Dean, allowing him to lead the latter blindly into a trap. Due to his frailty, Jeffrey used sedatives to overpower his victims. Hallucifer points out this inconsistency to Sam, reasoning that a demon would be more than strong enough to commit the murders without drugs.
Jeffrey describes the method in which he builds his "list": he hears a whistling sound coming from the victims' brains which compels him to follow them home. Originally he lacked the nerve to pursue them further before his possession. He claims to be in love with the demon and enjoys the excitement of being connected to something so powerful. This is similar to Lucifer's statement whilst possessing Sam: "You can feel it, can't you? The exhilaration!" It is also reminiscent of Jimmy Novak's "...kinda like being tied to a comet..." description of being a vessel.
The demon started murdering the women on Jeffrey's "list" and removing various organs from their bodies Jack the Ripper style, before being tracked down and captured by the Winchesters with help from a Wiccan, Nora Havelock. Sam and Dean were hunting the arch-demon Lilith at the time and interrogated the Jeffrey!Demon for information on her lieutenants.
The demon released control for a few minutes, allowing the Winchesters to ask for Jeffrey's permission to torture the demon. Feigning remorse, Jeffrey permitted them to do whatever it takes to stop the demon before being taken over by the demon again. Sam and Dean tortured Jeffrey!Demon into revealing the name of a higher-up, a demon called Merrick. They then exorcised the demon and dropped a severely beaten Jeffrey off at the hospital.
Over the next four years Jeffrey fell into a deep depression and started drinking, resulting in him losing his job and speaking about his experiences to other people. This led to him being committed and spending some time in a mental institution before joining a live-in therapy group. To most he seemed to be recovering from a troubled past, but in truth he was suffering from separation anxiety from his exorcism.
Jeffrey began researching ways to summon demons from Hell and sought Nora's expertise, but she turned him away. The next day he kidnapped her son and demanded her help in exchange for his return. Nora translated a spell for Jeffrey but it didn't work and he refused to return the boy. She was then able to decipher another ritual that would work, but Jeffrey still kept her boy hostage and sent Nora his ear as a warning.
In the meantime, Jeffrey started carrying out more murders from his "list," having gathered the courage from his possession and, ironically, his guidance counselor (albeit unwittingly). The murders attracted the attention of the Winchesters, who returned to investigate with Nora's help again. They visited Jeffrey in the chance that he was possessed again, but found him "normal."
Jeffrey tricked Sam into pursuing a potential victim, thereby allowing him to lead Dean to his "nest" where he kept Nora's son captive. When Dean tried to release the boy, Jeffrey injected a sedative into his neck and tied him up. When Dean awoke, Jeffrey prepared the summoning ritual and explained that he actually enjoyed being possessed and considered the demon the "love of [his] life." He then took some of Dean's blood and used it along with the heart of his pet dog to complete the summoning.
The demon did not manifest in him, however, choosing Nora's son instead. Jeffrey!Demon congratulated him on realizing his potential but refused to possess him again, much to Jeffrey's dismay. Dean broke free from his binds and attacked the demon, but was overpowered. Having learned the truth from Nora, Sam appeared in time to save Dean by drawing the demon into a devil's trap. Nora then started exorcising the demon.
- Jeffrey's character may refer to Jeffrey Dahmer, who murdered 17 men and boys between 1978 and 1991.
- Jeffrey's rockabilly haircut, country accent, and Detective Sutton's "cold-blooded" remark may refer to Richard Hickock, killer of the Clutter family in 1959, as told in Truman Capote's non-fiction crime novel In Cold Blood.