Yorkshire Ripper Peter Sutcliffe has been moved out of Broadmoor psychiatric hospital and back into jail, according to reports.
Sutcliffe, 70, has spent 32 years inside the high-security institution in Berkshire after murdering 13 women and attempting to kill seven more between 1976 and 1981.
The police investigation into his attacks came to Sunderland when John Humble sent detectives tapes claiming to be the murderer between 1978 and 1979.
The Wearside Jack case led to Humble being jailed for eight years in 2006 for perverting the course of justice after he was traced though DNA on the envelopes.
Plans for the transfer of Sutcliffe his transfer emerged earlier in August and The Sun reported that he had been moved on Wednesday.
It has been reported he is now in HMP Frankland, on the outskirts of Durham.
Sutcliffe, who has been in Broadmoor since 1984 after he was diagnosed with paranoid schizophrenia following his life sentence in 1981, will continue to have his mental health assessed in prison and could be returned to a psychiatric hospital if there is a change in his condition.
It has been estimated that the move will save the taxpayer hundreds of thousands of pounds.
Dr Ruth Tully, a consultant forensic psychologist at the University of Nottingham, said cost would not have been a factor in the ruling that the serial killer is sane enough to be transferred but that the cost difference was considerable.
Figures show that it costs around £325,000 per year to keep a patient in Broadmoor, compared with around £45,000 per year in a category A prison.
Sutcliffe, a former lorry driver from Bradford, now calls himself Peter Coonan. Most of his victims were prostitutes who were mutilated and beaten to death.
He was given 20 life terms for the murders and was caught when police found him with a prostitute in his car.
They became suspicious and found he had a fake licence plate and weapons including a screwdriver and hammer in the boot.
Before he was moved to Broadmoor, the killer spent three years at Parkhurst prison on the Isle of Wight.
A Prison Service spokeswoman said: "We do not comment on individuals."