Dorium Maldovar

Dorium Maldovar was a black marketeer in the 52nd century. After being beheaded by the Headless Monks, his still-living head is kept in the Seventh Transept; his marketing deals in the black market have come to an end because of such. However, he can still supply information.

Biography
In 5145, after hearing that she was in search of time travel, Dorium met with River Song in the Maldovarium bar to offer her a Vortex manipulator that was "fresh off the wrist of a handsome Time Agent" and wonder if she had a "pretty toy" as payment for him. River offered him a Callisto Pulse which could disarm Micro-explosives from up to twenty feet, such as the kind she had just put in his wine. Annoyed, Dorium saw he had no choice but to give her the Vortex Manipulator. (DW: The Pandorica Opens)

Dorium sold a Judoon's brain that contained a security protocol to a trio of Headless Monks, receiving a bag of sentient money. As his customers left, he questioned their motives for kidnapping "the child" and told them not to provoke the Doctor's anger and rage. (WC: Prequel (A Good Man Goes to War))

Dorium was one of many people who owed the Doctor a debt and was summoned by him to help rescue Amy and her baby at Demon's Run. He did not serve in a combat role, but went into the station's computer and discovered that Melody Pond had 'Human plus Time Lord' DNA.

Dorium made a fatal mistake when he and the others were surrounded by the Headless Monks. He believed they were his friends and would not harm him. He approached them with open arms, but they swiftly decapitated him and added him to their ranks. His headless body was subsequently killed by the Doctor's remaining allies in their fight against the monks. (DW: A Good Man Goes to War)

The Doctor was told by the alien Gantok that Dorium had information about the Silence. The two went to the Seventh Transept, where all of the heads of those whom the monks had beheaded were stored. In a box was the decapitated head of Dorium, kept alive and able to speak by unspecified means. Dorium told the Doctor that on the fields of Trenzalore, at the fall of the Eleventh, a question would be asked, a question that must never be answered. The Doctor took him aboard the TARDIS. Dorium tried to explain to the Doctor that he must die at some point. Dorium saw he was not getting through to the Doctor, but became shocked that he changed his mind about prolonging his death at Lake Silencio after learning his old friend, the Brigadier, had passed away.

Later, a Headless Monk was seen walking with Dorium's head to the Cave of Skulls. Dorium wondered who was carrying him and realised immediately that it was the Doctor, but wondered how he could still be alive after the Lake Silencio incident. To his shock, Dorium learned that the Doctor used the Teselecta to fake his death and was planning on going back to the shadows. As the Doctor left, Dorium warned him that Trenzalore and the Fall of the Eleventh were still waiting for him, and called after the Doctor the first question in the universe, which he had been running from his entire life: "Doctor Who?" (DW: The Wedding of River Song)

Behind the scenes
The Brilliant Book 2012, a non-canonical REF book, puts forward these ideas; 


 * Dorium would later supply Madame Kovarian with unknown infomation.


 * Colonel Manton reported to the Papal Mainframe that Dorium's head was not found after the battle.