YORKSHIRE Ripper Peter Sutcliffe may have committed a further 47 despicable crimes - including murders and sex attacks.
A retired detective has revealed that police originally prepared a list of offences to be taken into consideration which were never put to Sutcliffe.
The document is now being used as ammunition in the case to make sure the 13-times killer is never released from Broadmoor high security hospital.
Sutcliffe has expressed the desire to one day regain his freedom and to have plastic surgery so that he can start a new life in America.
But it has emerged that Ripper Squad detectives had listed 47 other crimes in the hope of solving cases which date back to when Sutcliffe was a teenager.
Retired detective constable Alan Foster, who helped compile the list, said the crimes should be reinvestigated today using modern technology and DNA techniques. Detectives strongly suspect that lorry driver Sutcliffe, now 58, was responsible.
"The families of all victims have an absolute right to know who had killed their loved ones," said Mr Foster. "Sutcliffe may have eventually admitted to many more offences - but senior officers cut short an interview with him at Dewsbury Police Station before such things could come out."
The first offence on the list was the murder of a bookmaker in Bingley in 1965.
Sutcliffe's father John, who died last year, was among the witnesses interviewed by detectives. The Sutcliffe family lived nearby at the time.
Another attack happened 12 months later when a taxi driver picked up a fare near Leeds University and took a passenger to the moors above Keighley. The driver was repeatedly hit over the head with a hammer - Sutcliffe's favoured killing weapon - but survived.
The victim told police his attacker looked like an Arab Sutcliffe's with black crinkly hair, a high-pitched voice, and not particularly tall - a description closely resembling Sutcliffe.
Another murder on the list involved the killing of a young woman in Hemel Hempstead. The victim, who was never identified, was believed to have been a prostitute, like several of Sutcliffe's victims.
Mr Foster said: "The reason for compiling the list was to eventually challenge Sutcliffe with the crimes, and to take statements from him admitting his guilt.
"But I do not believe that the Ripper was ever confronted with them."
Former Det Chief Supt Jim Hobson, who took over the Ripper inquiry from George Oldfield, has broken a 25-year silence to insist the killer stays locked up.
"I do not think Sutcliffe should ever be released, full stop," he said.
Sutcliffe's five-year reign of terror ended in 1981 when he was jailed for life for 13 murders and seven attempted murders. His victims included Helen Rytka and Theresa Sykes in Huddersfield.