He rarely answered a question directly, and when he did, it was always on his own terms. He obviously knew as much about Mulder as Mulder himself did and admitted to watching him for a long time from "his lofty position". Whether it was with the intent of helping the younger man uncover the truth (as he often said) or to hinder him through misdirection, he was always an important source of information. He contacted Mulder through the most wierd methods such as a click on the phone (Eve). In "EBE" Mulder signals his desire to meet himby shining a blue light through the window. Mulder was always very secretive about him with Scully In "Deep Throat" Mulder tells her that he was approached by "a man" in washinton who warned him off. She first met him in "The Erlenmeyer Flask".
Manipulative, avuncular and enigmatic, he created a presence in The X-Files before sacrificing himself for his protege in the final episode of the first season "The Erlenmeyer Flask". He was shot in the heart by the Crewcut Man in May 1994, most probably Cigarette Smoking Man was responsible for it. Buried at Arlington Cemetry, Mulder observed the funeral through binoculars from a distance.
Name
Cancerman calls him "Ronald" in "Musings." The actual name "Deep Throat" (taken from the name of an informant in the Watergate affair and a rather sly double entendre) is not given in the show until Scully uses the name in "The Erlenmeyer Flask". In "EBE" he is called merely a "source of deep background" - the same phrase as was used of the real Deep Throat.
We, however, have known of the name since the episode called "Deep Throat." However, in true X-Files cryptic style, the name is never mentioned within the episode itself and is merely in the title.
He used to work with the CIA ("Musings" and "EBE") Along with Cancerman and Bill Mulder is looks as if he was part of a CIA Black Ops unit operating within the military. He was in Vietnam with the CIA when the Marines shot down an EBE over Hanoi. He was the one who had to shoot it, true to a 1940s secret international agreement that whichever country found a live alien had to destroy it. They way it looked at him as he killed it has haunted him ever since, and his helping Mulder is an admittedly very belated attempt to atone.
He appears, along with Cancerman, WMM, Bill Mulder, Victor Klemper and others in the photograph taken outside the Strughold Mining Company in 1972 or 1973.
"Musings" could be taken to suggest that Deep Throat was the Consortuim's chief propagandist
Clicks on the phone ("Eve") to arrange a meeting. Mulder signals his desire for a meeting by shining a blue light through the window ("EBE")
Does Scully know about him?
In "Deep Throat", Mulder tells her that he was approached by "a man" in Washington who warned him off. However, by "EBE" she still doesn't know anything about him. This seems to be the first time Mulder tells her anything about him. She finally meets him in "The Erlenmeyer Flask."
Interest
Like Mulder, he is fond of sport. In "Eve" he offers to take Mulder to a Warriors game, as he was "just in the neighbourhood." In "EBE" he and Mulder lament the fact that they can't catch a game together at the Camden Yards. Of course, Deep Throat says, they couldn't sit together, which Mulder says is a pity as he's sure Deep Throat has the connections to get the best seats. Deep Thoat says he can indeed - "any park in the country."
Death
May 1994. Shot in the heart by Crewcut Man. Buried at Arlington Cemetery. Mulder observed the funeral through binoculars from a distance