After his arrest, police rifled through Brady's books on sadism and perversion and found plans on how to dispose of Evans' body on the moors.
Hindley died in 2002 after 36 years in jail and was Britain's longest serving female prisoner.
The serial killer, who used the name Ian Stewart-Brady before his death, was a patient at Ashworth Hospital on Merseyside where he was reportedly receiving palliative care.
At a court hearing in February lawyers said he had been bedridden for the last couple of years and it was "fair to say" he is terminally ill, with emphysema among his ailments.
One of Britain's most notorious killers, "Moors murderer" Ian Brady, who murdered five children with his lover and accomplice Myra Hindley during a sadistic two-year reign of terror in the 1960s has died.
The killings became known as the Moors Murders, because four of the five children's bodies were dumped in the south Pennines.
During an 18-month killing spree between 1963 and 1965 Brady and Hindley tortured and killed the five children, recording some of the horrific violence on tape and photographing themselves close to the burial sites.
Brady began a "hunger strike" at the high-secutiry Ashworth Hospital in 1999 but the decision to starve himself was later revealed as a sham.
Nearly 20 years later, in 1985, he admitted to the murders of Pauline Reade, 16, and Keith Bennett, who was 12.
"I would beg him to do the right thing on his deathbed and tell us where Keith (Bennett) is".
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Brady had told Hindley he wanted to "commit the flawless murder" that night. He received three life sentences to run concurrently. Her body was buried on the moor but not found until 1987 when the pair finally confessed.
Once she got there, they sexually assaulted and killed her. Brady later claimed it was Hindley who murdered her.
Brady's death was confirmed by the NHS.
Caroline Cairns posted: 'Rest in Hell Ian Brady, feel for the family of Keith Bennett who never found out where he was buried'.
As before, Brady and Hindley took their victim to Saddleworth Moor on the pretext of searching for a lost glove.
He told Hindley to drive around in her van with him following on his bike until he spotted a victim Hindley was then to offer a lift to.
Brady refused to help a special investigation in 2003 to once again find Keith's remains.
She became their youngest victim when she was lured from a fairground to the house Hindley shared with her grandmother in Hattersley.
Had the pair not made a crucial blunder in involving Hindley's brother-in-law David Smith in their next enterprise, the murder of Edward Evans, 17, might not have been their last.