Depraved Brady wants to be moved from the secure hospital where he is currently imprisoned - and where he is force fed by a tube after beginning a hunger strike 12 years ago - to a normal prison where he could starve himself to death.
Winnie Johnson, 73, who is suffering from cancer, spoke to the Sun from her hospital bed and implored the courts not to 'let that monster die before me'.
Brady, 74, was declared criminally insane in 1985, but now wants to prove he is sane in order to be moved to a Scottish prison to die.
Along with his girlfriend Myra Hindley, Brady sexually tortured and killed five children in the 1960s. Their bodies were buried on Saddleworth Moor in Greater Manchester, although Keith's body has never been found.
Winnie has now asked Judge Robert Atherton to keep Brady in Ashworth, saying: "Please set a new date as soon as possible. He should be in hospital, where he is meant to stay.
"I want him to suffer and be kept alive as long as he can."
Little Keith disappeared four days after his 12th birthday in June 1964. He was raped, photographed and strangled by Brady.
The police have never told his mum the full details of his murder. Speaking to the Guardian earlier this year, Winnie said of the evidence: "I did and I didn't want to know. I asked them once and they wouldn't tell me. I don't want to see the photos. It would break my heart – it would kill me."
Winnie has previously written to Brady begging for information as to where Keith is buried on the moors. The killer claimed in 2006 he had 'clarity' about where the little boy's body was, but later claimed the police had 'bungled the search', callously telling Winnie 'this is my last word on the matter'.
His heartbroken mum feels time is running out for her to recover his body: "I want to bring my son home," she told the Sun.
Brady's accomplice, Myra Hindley, died in prison in 2002.
Such a terrible, on-going situation for poor Winnie.