A documentary about Manchester Moors murderer Ian Brady will be shown on Channel 4 tonight after family of the late Winnie Johnson gave the broadcaster their approval.
Mrs Johnson, mother of Keith Bennett who was abducted and killed by Brady and his girlfriend Myra Hindley in 1964, died on Friday night without ever finding out where her son was buried after losing her battle with cancer.
Just hours before her death police were informed that Brady, 74, may have revealed the location of Keith’s grave in a letter to Mrs Johnson – following an interview with the documentary’s team and Brady’s health advocate Jackie Powell.
Powell claimed that Brady gave her a sealed envelope to pass on to Mrs Johnson following his death – detectives later arrested Powell at her home in South Wales on suspicion of preventing the burial of a body without lawful exercise.
A spokesman for Channel 4 said: "This documentary will be airing tonight as planned following consultation with Winnie Johnson's family and with their approval.
"There will be tweaks to reflect Winnie's sad passing but otherwise the film will remain unchanged."
Mrs Johnson held a memorial service for her son at Manchester Cathedral two years ago – the nearest the family came to a full funeral for Keith – and in a tearful statement said: "I'm Keith's mother... he's there on the Moors, I want him back."
Keith's brother, Alan Bennett, who was nine years old at the time of abduction, vowed to continue fighting to find the grave in Saddleworth Moors and said the death of their mother should be seen as closure to the investigations.
Mr Bennett said: "As far as I am concerned, until Keith is found then he is still in the possession of Brady and Hindley."
Detectives are continuing to examine a large number of seized documents from Powell’s home and Brady’s prison cell but have so far found no letter – Powell was bailed pending further investigations.