Detectives investigating the murders of five women in Suffolk have released CCTV images showing the final train journey taken by one of the victims.
Anneli Alderton was last seen on a train in Essex
Anneli Alderton, 24, caught the 1753 GMT train from Harwich to Colchester on 3 December, a week before her body was found near Ipswich.
Police said Miss Alderton was three months pregnant when she died.
In a press conference, Det Chf Supt Stewart Gull said none of them had suffered "self defence wounds".
Nor had any of the women showed any evidence of sexual assault.
'Where did she go?'
Describing the CCTV images, Det Chf Supt Gull renewed an appeal for information on where Miss Alderton went when she left the train.
He said: "We now need to piece together Anneli's movements after this image was captured.
"At what station did Anneli get off the train? And where did she go after that?
"I would ask people to look carefully at the images. If anyone saw Anneli after the evening of Sunday 3 December, we want to hear from them."
Police have received reports that Miss Alderton was seen getting into a blue BMW car in Ipswich's red light district.
Mr Gull said: "We have spoken to the driver of a BMW as I understand it.
"He has not been eliminated but we have had contact with him and we may need to speak to him again."
Earlier, Assistant Chief Constable Jacqui Cheer told the BBC: "Miss Alderton was three months pregnant. But we do not regard that as having any relevance to the inquiry - however sad it may be."
On Saturday police appealed for help at the start of Ipswich Town's football match against Leeds United. A minute's silence was held at Portman Road and prayers said for the dead women.
Police confirmed they were interested in speaking to 50 to 100 people and explained they were in different groups, split between those being spoken to and those who were still to be questioned.
ACC Cheer added: "A good way to describe the progress we are making would be to compare the investigation to a jigsaw.
"We have constructed the edges, now we have to fill in the middle."
Officers have also contacted more than 300 registered sex offenders in the county.
Suffolk Police said a detective inspector was liaising with members of the press in case they found out information which could help catch the killer.
Police are considering staging a reconstruction of the last known movements of one of the women in the hope of jogging people's memories.
They have also said they want to speak to a man who attended a memorial service for the five women in the company of a teenage prostitute.
Andrew Purdy, 44, a property developer from Holbrook, told the Press Association he knew the dead women as friends and had tried to help two of them get off drugs.
On Friday a fifth body found was confirmed as that of Annette Nicholls, 29, who worked as a prostitute.
Her body was discovered naked at Levington near Ipswich, but a post-mortem examination failed to reveal exactly how she died.
The other three murdered women are Gemma Adams, 25, Tania Nicol, 19, and Paula Clennell, 24.
POLICE PHONE NUMBERS
Suffolk hotline: 0800 096 1011
Crimestoppers: 0800 555 111
Police said all the women were found naked. Miss Alderton was strangled and Miss Clennell died from a "compression to the neck". The causes of death for Miss Nicol and Adams have not yet been ascertained.
Toxicology tests are being carried out on the bodies of all five women, who were all drug users.
Police said they had received more than 8,000 calls following a public appeal for information - with about 1,000 people calling in the past 24 hours.