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An open letter from the brother of a Moors ­murderers’ victim ­is ­piling pressure on ­the authorities to reveal ­killer Ian Brady’s ­secret stash of papers.

Alan Bennett believes ­documents in locked ­briefcases may show where Brady and his lover Myra Hindley buried his 12-year-old brother Keith.

Alan spent ten years searching Saddleworth Moor for the lad.

Their mum Winnie Johnson, who died in 2012, aged 78, campaigned tirelessly to find Keith.

Alan, 63, wrote: “My ­family has suffered enough. All we want is to put Keith to rest.”

Police applied for a ­warrant to open the cases but were refused by a district judge, because any ­evidence would not be “relevant”.

(Image: PA)

Brady’s lawyer Robin Makin, acting on his client’s instructions, refused to give them to Greater Manchester cold case officers.

John Ainley, Alan’s solicitor, said: “Only my client and the police have ­sufficient background information to know whether there are any clues among Brady’s papers to help find Keith, some of which may be coded.

(Image: PA)

“My client’s heartfelt request for help is aimed at those who have the power to assist him find closure for all the family.”

In 1991 Brady wrote to Alan saying: “I again advise you to stop searching until ­matters are resolved.

"My will contains special instructions for you alone. My time is almost over. Sincerely, Ian Brady.”

(Image: Getty Images)

But 26 years later, when Brady died aged 79, Alan was still denied clues. Keith was snatched in June 1964, ­tortured and put to death.

He was the fourth of five children murdered by the pair.

Alan said: “My mother repeatedly begged her killers to reveal what they did with Keith but they refused.

She died never knowing the location of his final resting place.

“More disturbingly, we’ve never been able to give him a proper burial or say our final farewells.

(Image: Liverpool Echo)

"That’s what drives me to keep going and why I refuse to give up hope.”

Mr Ainley said: “I appreciate there may be confidentiality issues affecting the solicitors and executors in these circumstances.”

Martin Bottomley, of GMP’s cold case review unit, said civil action is being taken but added: “Brady’s representatives, ­executors or beneficiaries could ease this process and voluntarily assist Mr Bennett.”