Channel 4, which commissioned the documentary 'Ian Brady: Endgames of a Psychopath', has released this transcript on an interview with Brady's mental health advocate Jackie Powell.
Ms Powell said:
I received a letter and a sealed envelope which said on the front of it, to be opened in the event of my death.
He says that he doesn't wish to take secrets to his grave and that within the sealed envelope is a letter to Winnie Johnson and that within that is the means to her possibly being able to rest.
And that's paraphrase, that's not verbatim.
When the interviewer, director Paddy Wivell, asked what Brady could have meant by that, Ms Powell replied:
Well clearly there's something within the letter that may be able to find her son I would suggest.
She told the documentary makers that she has not opened the sealed envelope and she cannot be certain of its contents.
Channel 4 has said that neither it nor the producers have had sight or possession of the envelope.
The director of a documentary that revealed the possible existence of a letter from Ian Brady to the mother of one of his victims has suggested this could be "some sort of victory dance" for Brady. Paddy Wivell told BBC Radio 4's Today programme:
– paddy wivell, director of 'Ian Brady: Endgames of a Psychopath'
I think we probably have to approach it [the possibility of the letter] with some sense of caution too. This seems to me like very much part of Brady's pathology, one of power and control.
He is a sadistic psychopath and it would appear that this is some sort of victory dance, a kind of power game, in the fact that he constantly puts conditions on things.
The condition that it can only be opened in the event of his death is consistent with this kind of behaviour over the years.
Greater Manchester Police have said that they do not know the location of Keith Bennett's body, but that there are investigating the possibility that Ian Brady wrote a letter to Bennett's mother.
They confirmed that "a number of documents" had been seized from the home of Brady's legal advocate.
– Martin Bottomley, Head of Investigative Review, Greater Manchester Police
I want to be explicitly clear about this: Ian Brady has not revealed to police the location of Keith's body.
What we are looking at is the possibility, and at this stage it is only a possibility, that he has written a letter to Keith's mum Winnie Johnson which was not to be opened until after his death.
We do not know if this is true or simply a ruse but we clearly have a duty to investigate such information on behalf of Keith's family.
The lawyer for Winnie Johnson, the mother of Keith Bennett, fears the news of a possible letter from Ian Brady containing details of where he is buried may have come to late for her:
She has remained steadfast in her resolve that Ian Brady has held the key to this tragedy.
Over the years she has appealed directly to Brady and through me for him to reveal where Keith's body was hidden so she could at least give her son a decent burial before she died.
Now, she herself is ill and I am deeply concerned that the knowledge of this letter and its alleged contents may have come too late to bring her any solace.
It would be the last tragic act of a truly harrowing story.
Ian Brady's mental health advocate, Jackie Powell, contacted police herself on the suggestion of a television production company that she gave an interview to, Sky News reports.
It is also reported that she refused to confirm or deny the existence of a letter Brady allegedly addressed to a victim's mother.
The editor of a television production company, which interviewed Ian Brady's legal advocate, has said she has not seen the envelope that Ian Brady allegedly addressed to his victim's mother, Winnie Johnson.
Emma Cooper, documentaries commissioning editor for Cutting Edge, said:
– Emma Cooper, Cutting Edge
No-one can verify the contents of the envelope and therefore what information it does or does not contain but given the enormity of the implications as suggested by Brady's letter, we felt we had a responsibility to inform the family via their family liaison officer.
Winnie's poor health was foremost in our decision-making and this is why we have decided to bring forward the broadcast of the film and make the existence of the envelope public.
It is understood that Winnie Johnson, the mother of one of Ian Brady's victims, is not yet aware of the ongoing developments relating to the possible location of her son's body.
Her lawyer, John Ainley, told the Press Association: "Winnie has always believed that Ian Brady knew where her son was buried. She never thought anything else.
"He had a dialogue with Winnie some years ago and she was certain that he could have provided information that would have given her closure in this harrowing case."
Ian Brady's legal advocate may have revealed the existence of a letter from Brady to a television production company working on a Channel 4 documentary.
In the documentary, which airs on Monday , she says that Brady gave her a sealed envelope to give to Winnie Johnson, the mother of his 12-year-old victim Keith Bennett, in the event of his own death.
"Following Brady's seizure and the subsequent indefinite postponement of his mental health tribunal, she discloses, on camera, some startling information that appears to present further important evidence of Brady's ongoing attempts to assert power over the victims' families."
The film, called 'Ian Brady: Endgames of a Psychopath', will be broadcast on Monday at 9pm.
Ian Brady's mental health advocate, Jackie Powell, has told Sky News that her words have been "misrepresented" and "blown out of all proportion".
Powell, 49, is reported to have told a television production company that Brady gave her a letter to give to Winnie Johnson, the mother of his 12-year-old victim Keith Bennett, in the event of his own death.
Powell was arrested by police on suspicion of preventing the burial of a body but she has now been released on bail.
Greater Manchester Police say they have nothing that would lead them directly to Keith Bennett's bodyat the moment, Sky News reports.