Brady (above) has written a letter to the mother of Keith Bennett, which he passed on to his legal rep Jackie Powell. Since Keith vanished aged 12 in 1964, his body has never been found.

“I received a letter and a sealed envelope which said on the front of it, to be opened in the event of my death,” Powell told a Channel Four crew filming a documentary about Brady.

“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.

‘Well clearly there’s something within the letter that may be able to find her son I would suggest,” she said, responding to a question about the letter’s contents.

The letter has not yet been given to Keith’s mother, as the serial killer said he wanted the note handed over when he died.
Brady is serving life in a high-security prison for the abduction and murder of five children and teenagers nearly 50 years ago.

The documentary’s director Paddy Wivell told BBC Radio 4’s Today programme: the revelation should be approached with a sense of caution.

“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.”

Last night, Greater Manchester Police said a 49-year-old woman had been arrested in South Wales on suspicion of preventing the lawful burial of a body and said searches were ongoing.