Detectives investigating the murder of five prostitutes in Suffolk today confirmed that the last body discovered was that of Annette Nicholls.
The 29-year-old was last seen at 9.50pm on December 5 by a member of the public wearing leggings, boots and a bomber jacket.
A post-mortem examination failed to find a clear cause of death and further tests are being carried out.
Police confirmed that they were treating her death as murder and linked it to the other four killings in Suffolk.
Detective Chief Superintendent Stewart Gull said: "The launch of a fifth murder inquiry is unprecedented for Suffolk Constabulary."
A relative of Tania Nicol, one of the victims, will make a personal appeal for help to find the killer at 1pm at Suffolk Police headquarters.
Miss Nicholls' body was found naked but she was still wearing jewellery.
Mr Gull said five separate inquiry teams had been set up to investigate each murder.
"Each is staffed with specialist staff and headed by a fully-trained senior detective," he said.
"All these resources are committed solely to catching those responsible for the murder of these five vulnerable women."
He said more than 250 police officers were working on the inquiry and Suffolk Police had received assistance from 26 police forces around the country.
Detectives have received 1,800 calls from the public in the last 24 hours, on top of the 5,500 already received.
Mr Gull described the response as fantastic.
He appealed for information from anyone who might have seen Miss Nicholls between December 5 and December 12 when her body was found.
He reiterated his appeal for information about anyone who may have used two lay-bys on the Old Felixstowe Road near where the bodies of Miss Nicholls and 24-year-old prostitute Paula Clennell were found in Levington.
He said Miss Nicholls was wearing dark-grey patterned leggings, calf-length boots, a black top with a low neckline and a dark-coloured bomber jacket.
"We are extremely keen to trace Annette's clothing, as well as the clothing of the other women," he said.
The other three murdered prostitutes are Gemma Adams, 25, Tania Nicol, 19, and 24-year-old Anneli Alderton.