The father of a woman murdered in London seven years ago has appealed with detectives from the Metropolitan Police Service for the main suspect to speak to officers.
Norwegian student Martine Vik Magnussen was found murdered in flats in Great Portland Street in 2008. She had also been raped before her death.
Following the murder, detectives formally named Farouk Abdulhak, then 21, as the suspect they wanted to speak to in connection with Martine's murder and rape.
Abdulhak fled to the Yemen before she was discovered partially concealed by rubble in the basement of the building he lived in. Now aged 28, he is the only person wanted in connection with this crime.
Police have made numerous appeals to Abdulhak to return to the UK, but so far he has not returned.
On Wednesday 11 March Detective Chief Inspector Andy Partridge, the officer in charge of the Met's investigation stood side by side with, Martine's father, Odd Petter Magnussen as he made a heartfelt appeal for him to come forward at the British Embassy in Oslo, Norway.
DCI Partridge said: "We are determined to get justice for Martine's family and this year we have come to Norway to support her father, Petter in his plea to Farouk Abdulhak to show some conscience and turn himself in to the British police.
"Last year we took the unprecedented step of posting an advert on Facebook to target users in the Yemen and encourage people close to Abdulhak to pressure him to return to the UK. The advert reached nearly 350,000 people."
The dedicated Met webpage received 9,029 views, 7,160 of which were from the Yemen. The appeal was also supported by the British Embassy in Yemen who ran the appeal on their Facebook site.
Martine, 23, who lived with friends in Westminster, had been out with her flatmates and fellow students in central London on the evening of 13 March 2008.
She was last seen by her friends at Maddox nightclub some time between 02:00 and 03:00hrs on 14 March 2008.
She is believed to have left in a cab with Abdulhak, a fellow student of Martine's at Regent's Business School who was known to socialise with Martine and her friends.
Martine was subsequently reported missing to police by friends on 15 March 2008.
After she was reported missing, officers making inquiries to trace her attended the residential address in Great Portland Street, W1. Her body was discovered at around 10:30hrs on 16 March 2008.
A post-mortem examination gave cause of death as compression to the neck.
An incident room was opened at Hendon.
The inquest into Martine's death at Westminster Coroner's Court on 24 November 2010 recorded a verdict of unlawful killing.
Detectives have made numerous appeals for Abdulhak to return to the UK so that they can speak to him about Martine's death.
It is known that Abdulhak left the UK on a flight to Cairo on the afternoon of 14 March 2008, and from there it is believed he travelled to Yemen.