Ms Magnussen’s body was found on March 16 2008 in a residential block in Great Portland Street, Westminster. A post-mortem concluded she died as a result of “compression to the neck” and had been raped.
According to a letter seen by The Metro the Queen, via her private secretary, wrote to Ms Magnussen’s family and asked her team to raise the case with then Home Secretary Alan Johnson.
In the letter the Queen’s secretary said: “Her Majesty was deeply sorry to read of the terrible loss that you and your family have suffered, and the continuing distress caused by the fact that your daughter’s killer remains at liberty.
“She has asked me to convey her sincere condolences to you and your family.”
Police are only seeking one suspect, 34-year-old Farouk Abdulhak, in connection with the incident.
The billionaire’s son left the UK hours after Ms Magnussen’s death and is believed to be in Yemen.
The Metropolitan Police are urging him to return to Britain in order to answer their questions.
Earlier this month detective inspector James Howarth, the Metropolitan police officer leading the investigation, urged Mr Abdulhak to “come back to face justice”.
He said: “In the past 13 years, Martine’s family and the Met have kept this investigation in the public’s thoughts, raising it again and again.
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