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Moors murderer Ian Brady's secret trove of letters, maps and photographs could finally be released today as an inquest is held into his death, it is reported.

The 79-year-old serial killer died at Ashworth High Secure Hospital in Maghull, Merseyside, in May this year, after spending more than 50 years behind bars.

Four months on, notes and other documents from his private collection could be revealed at his inquest, due to get under way at Bootle Town Hall this morning.

Experts reportedly believe the letters, maps and images could help to solve the decades-long mystery of the location of 12-year-old victim Keith Bennett's grave.

For live updates on Brady's inquest, click here

(Image: PA)

(Image: PA)

Erica Gregory, who has spent years investigating the Moors murders, says the documents will likely "have clues" that could "help lead" to the little boy's remains.

She told the Daily Star Online : "He [Brady] had boxes of letters that could hold the key.

"Over the years, several people wrote to him but there will be dozens in there from Myra Hindley and David Smith. These ones will have clues in that could help lead us to Keith – clues Brady wanted to keep to himself."

Bradly had famously kept the documents hidden from campaigners. But he requested that, after his death, his photos and paintings be sold.

Today's inquest could also see his final resting place revealed publicly.

Sefton coroner Christopher Sumner had initially refused to release the murderer's body until he was given assurances the ashes would not be spread on Saddleworth Moor.

(Image: Rex Features)

(Image: Julian Hamilton/Daily Mirror)

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This is where remains of four of Brady and Myra Hindley's five child victims were found.

Brady never revealed where he buried Keith, despite emotional appeals from the boy's mum.

The killer's body was released to his lawyer, Robin Makin, on May 18 after he said there was "no likelihood" of his ashes being scattered on the moorland.

An earlier inquest hearing was told Brady, also known as Ian Stewart-Brady, died of cor pulmonale, a form of heart failure, secondary to bronchopneumonia and chronic obstructive pulmonary disease, or lung disease.

In 1966, the child murderer and Hindley were jailed for life for the killings of John Kilbride, 12, 10-year-old Lesley Ann Downey and Edward Evans, 17.

They went on to admit the murders of Pauline Reade, 16, and Keith.

(Image: PA)

(Image: Getty Images)

Hindley died in jail aged 60 in November 2002.

Glasgow-born Brady had been held at Ashworth since 1985 and had been on intermittent hunger strikes since 1999.

In 2013 he asked to be moved to a Scottish prison where he could be allowed to die if he wished.

His request was rejected after Ashworth medical experts said he had chronic mental illness and needed continued care in hospital.

In February, he was refused permission to launch a High Court fight to have the lawyer of his choice representing him at a tribunal where the decision would be reviewed.