Police investigating the murder of model Sally Anne Bowman have made a fresh appeal for a witness to contact them, four months after she was killed.
Sally Anne Bowman was murdered after a night out
Ms Bowman, 18, was stabbed to death outside her home in South Croydon, south London, on 25 September.
Detectives want to speak to a man seen in Blenheim Park Road leaning on a fence next to a Ford Mondeo car.
Police also revealed details about a sex attack on a woman in Purley in 2001 which has been linked to the murder.
DNA evidence has established that the same man exposed himself to a woman as she made a call in a telephone box.
Det Ch Insp Stuart Cundy said the man they wanted to speak to was seen at about 0430 BST on the morning Sally Anne was murdered.
He was standing against a wooden fence next to a car which had one door open.
Mr Cundy said they first appealed for this man to come forward on the Crimewatch programme in December.
Cover of Vogue
"Do you know this man? He still has not come forward. We urge him or anyone who knows home to contact us. He may have vital information," he said.
Ms Bowman, who dreamed of being on the cover of Vogue, was bitten and stabbed to death before being sexually assaulted.
Her belongings including a Prada handbag, purse, mobile phone and bolero top may have been kept by her killer as trophies, said Mr Cundy.
It is thought he was lying in wait for her as she returned home after a night out in Croydon town centre.
The murder suspect is described as white, in his 20s or 30s, with short brown hair and is between 5ft 9in and 6ft tall.