The serial killer – who has died aged 74 after suffering from complications from Covid-19 - sat unsuspecting Sonia down in a prison confrontation after being arrested.
He confessed to her himself after -begging police not to tell her – and -justified his crimes by saying he was on a “mission” from internal voices to kill -prostitutes.
In a taped conversation -exclusively obtained by the Sunday Mirror the mass murderer, now 70, said: “I personally told Sonia what had happened after my -arrest. I asked the police not to tell her, just to ring her and let me explain.
“She had no idea, not a clue. I never had any blood on me or anything.
“There was nothing to link me, I was taking my clothes home and taking my clothes off and doing my own washing.
"I was working all day long and she was working as a teacher so I could only do it at night.
“She was deeply shocked when I told her. She couldn’t believe it.
"She knew there must have been something wrong but she had no idea what had happened.
“She was absolutely gobsmacked. It was hard to tell her but rather it come from me than a total stranger.
“I said a lot of things to police which sounded as though I was guilty.
“But I’ve never told anyone about the voices and hallucinations, which I now know they were. I had to hide that -because I was still on the mission.”
Fresh recordings of Sutcliffe’s -conversations have emerged as cops confirmed they had questioned him over 17 historic incidents.
The killer, sentenced in 1981 for 13 murders and seven attempted murders, agreed to speak to detectives from his cell in Frankland Prison, Durham.
Cases being reviewed are said to bear striking similarities to Sutcliffe’s crimes in which he brandished hammers, screwdrivers and knives.
The historic attacks are thought to include one on Maureen “Mo” Lea, who was battered in Leeds in 1980.
Then 20, she was hit with a hammer and stabbed with a screwdriver before her attacker was disturbed.
Maureen, now 57, said she did not believe new police inquiries would amount to anything, saying: “Their actions are like sticking a plaster on an avalanche.”
She revealed that she realised her attacker was probably Sutcliffe after he was arrested but that she did not say so for fear of being branded a hooker.
She added: “There were masses of pictures of him and there was this one of a side view and I knew it was him.
“But I daren’t come out and say what I thought because the press were saying all his victims were prostitutes. I was too scared to be tarred with that brush.”
Among the other cases is thought to be that of Tracey Browne, who was just 14 when she was hit with a hammer in Silsden, West Yorkshire, in August 1975.
A third is the 1974 case of Gloria Wood, 28, who was hit with a hammer on a school playing field in Bradford.
An inquiry in 1982, known as the -Byford Report, concluded Sutcliffe was “probably -responsible for many attacks he has not admitted”.
And last year the Sunday Mirror -exclusively revealed how cold case -detectives were collecting testimonies from more than a dozen potential victims as they launched a fresh probe.
It is now claimed the one-time lorry driver has been linked to as many as 23 unsolved killings.
Retired detective Keith Hellawell -believes his other victims might have included Barbara Mayo, 24, in Derbyshire in 1970, Gloria Booth, 29,in London in 1971 and Carolyn Allen, 17, in Leicestershire in 1974.
But speaking to a female admirer from Broadmoor Hospital before his transfer to high-security Frankland, Sutcliffe -dismissed claims of further crimes as “speculation” and “wild philosophies”.
He said: “There’s a lot of speculations about me as a person, wild speculations.
"None of these people have ever met me, you know? They just put wild -philosophies from their heads.”
In 1998 Sutcliffe was pinned to the ground in Broadmoor by deranged killer Ian Kay and stabbed 10 times in the face with a pen, leaving one eye blind.
Sutcliffe, who worked as a barber in the secure psychiatric hospital in -Berkshire, has also said he would -consider writing a book to “put things right”. He said: “Maybe I will in the future, maybe. I want to write a book because there’s a lot that needs putting right.
“I don’t know what I’d call it, the title’s not important. It would address all the rubbish that’s been written about me, it would be a long story.
“I’d give all the proceeds to charity. I wouldn’t be doing it for profit like these people do, definitely not.
“They’re only in it to make profit. They don’t really care what they say. They want to be popular with the public, so they say things against me to be popular.
“They put a slant on a book, not to say a single thing that’s nice.”
Judge won't give me a fair trial became of my nickname
Whingeing Sutcliffe has moaned from his prison cell he would never get fair treatment from “biased” judges because of his chilling nickname.
He claimed the Ripper tag forever associated with him is not a “true description” of what he is really like.
And he laid into amateur detectives who have suggested he is guilty of dozens of unsolved crimes.
From his Frankland cell he said: “There are people just filling people’s heads with rubbish. They are out and out totally biased against me.
“You don’t know who’s reading them, whether judges will take them seriously or see them for what they are.
“You don’t know what the judges are going to do. They tend to be biased, they see that nickname and they associate me with bad things and get a negative viewpoint.
“It’s only people on the inside who see beyond those things.
“That’s why I treasure keeping good friends, because people aren’t so stupid when they put their minds to things. It wasn’t a true description at all.”