The family of a holocaust survivor who was murdered 27 years after being liberated from a Nazi concentration camp have made a fresh appeal to bring her killer to justice - nearly half a century after her death.
Emmy Werner was found by a chambermaid at Queens Hotel in Bayswater, west London, the day after a trip to the theatre in September 1972.
She had been strangled and suffered numerous injuries at the hands of an attacker, who police believe had been intending to steal from her as she slept.
Werner, then 68, was born in Czechoslovakia and lived a comfortable life in the city of Brno until the German occupation in 1939, police said.
In 1942, she was transported with husband Albert and daughter Heddy to the Theresienstadt concentration camp near Prague, where tens of thousands of people were killed by guards, or by malnutrition and disease.
Months before the end of the war, Albert was taken to Auschwitz, where he was killed in February 1945. Emmy and Heddy, then 17, were liberated with the Allied advance that May.
Now, 45 years after her murder in London, detectives from the Metropolitan Police Special Casework Investigation Team hope a fresh appeal for witnesses could encourage people to come forward with information about her assailant.
Emmy's granddaughter Carolyn Franks, 58, said: "My grandmother was a vulnerable woman and no one should have to die like she did, especially after the trauma she had already endured.
"The effect on her close family continues to be a source of great sadness to us and we feel whoever killed her should be held to account."
A 16-year-old boy was charged within weeks of Werner's murder, but was acquitted at a trial in February 1973.
The night before the attack, Werner had been to see a West End show at the Vaudeville Theatre in central London.
She is thought to have settled into bed at around 8.30pm, before the attack in the early hours of the morning, police said.
Officers hope to trace people who used to work in and visited the hotel in the 1970s, who were mostly of different nationalities, including German holidaymakers and Swedish staff.
Detective Inspector Susan Stansfield said: "Although many years have now passed since Emmy's death, it remains particularly difficult for her family that she survived the horrors of the Holocaust yet died in such brutal circumstances. Emmy was 68 years old and was physically and mentally vulnerable due to her past.
"The hotel served a mixture of guests and employed a number of staff who were spoken to by police at the time.
"However, with the passage of time, it is possible that the events of that night have since been discussed and there is information that could be really useful to our inquiry. Or maybe someone who was scared to speak to officers at the time might now feel able to come forward.
"Did you stay or work at the hotel or in the area of Inverness Terrace, west London, in the early 1970s? Has anyone told you anything in confidence that you feel you should now disclose to police?
"We would also be interested in speaking to the friends - one from the hotel and an Italian woman - who Emmy went to the theatre with that night in case they have any useful information."