Former MP Harvey Proctor has said that historical child abuse and murder allegations launched against him have "wrecked" his life and lost him his job.
The former Conservative MP described an investigation by the Metropolitan Police's Operation Midland as a "homosexual witch hunt" and insisted he was "completely innocent" of the accusations.
Mr Proctor, 68, has been questioned twice but never charged over the alleged murder of three boys and claims of sex abuse more than three decades ago in Dolphin Square, an apartment complex near parliament.
He said that he had been accused of being part of a child sex-ring with the late Prime Minister Edward Heath and ex-Home Secretary Leon Brittan.
But he said that the allegations were "totally untrue claims against my name" and said that he and Heath "loathed each other".
At a press conference in the St Ermin's Hotel, London, he said: "The same Edward Heath, not surprisingly, would never speak to me in the House of Commons but would snort at me as he passed by in a Commons bar."
"It is so far fetched as to be unbelievable," he said.
(The allegations) amount to just about the worst allegations anyone can make against another person including, as they do, multiple murder of children, their torture, grievous bodily harm, rape and sexual child abuse.
Mr Proctor is the first person investigated by Operation Midland to make a public response.
After serving as MP for Basildon, then Billericay from 1979 to 1987, Mr Proctor became the private secretary to the Duke and Duchess of Rutland, David and Emma Manners, and was responsible for public and park events for Belvoir Castle.
In March, police raided his home in the 16,000 Belvoir estate.
He said that the man who made the allegations should either be charged with murder or his accuser should be stripped of his anonymity and charged with perverting the course of justice.
The complainant has told police that Mr Proctor was part of a group of men who carried out "systematic and serious sexual abuse" towards him from 1975 until 1984.
He accused Mr Proctor of being directly responsible for the murders of two boys and implicated in the death of a third.
High profile members of the sex ring, including Jimmy Savile, attended the child sex abuse parties, the complainant told police.
Mr Proctor said he did not "move in such circles" and that the accuser should be assessed to see whether he is of "sound mind".
Mr Proctor branded the allegations against him as "ludicrous" and said Metropolitan police commissioner Sir Bernard Hogan-Howe should resign "for the sin of hypocrisy" over claims the media were tipped off about a search of his home.
The former politician left Parliament in 1987 after pleading guilty to acts of gross indecency with rent boys aged under 21, the age of homosexual consent at the time.
I should be arrested, charged and prosecuted for murder and these awful crimes immediately so I can start the process of ridiculing these preposterous allegations in open court.