The family of Christina Menzies, a teenager killed in Germany in 1993, is offering a reward of up to £20,000 for information which leads to the arrest and conviction of her killer.
Christina's family has partnered up with independent UK charity Crimestoppers, and together with the Royal Military Police (RMP) they are appealing for information on the anniversary of her death.
The 16-year-old's body was found near RAF Gütersloh in June 1993.
"We know that people’s loyalties can change over time and we desperately hope that when nudged, someone’s conscience will be nagging them to set the record straight," Christine Menzies, Christina's mother, said.
In 1993, the Menzies family was living in Germany, with Christina's father, Staff Sergeant John Menzies stationed in the country.
On the night of 12 June 1993, Christina visited Club 47 at RAF Gütersloh station and never returned home.
Her body was found the following afternoon approximately 10km away from Club 47.
She had been strangled.
The RMP are asking for information about Christina's disappearance, including from people who may have already provided details, but may have further evidence that they did not mention at the time.
"It has been 27 years since Christina died and allegiances may have changed," an RMP spokesman said.
"You may feel that now is the right time to come forward.
"We are appealing for anyone who has information that might help us to catch Christina’s killer so that her parents can finally see justice for their daughter."
The RMP are also looking for information concerning Christina's shoes, which were missing when her body was found.
She was wearing a pair of black leather heeled shoes with a cross-over strap and metal buckle.
Police are also seeking information about a Union Jack duvet cover may have been used to cover or move her body.
Speaking in June 2017, Captain Teresa (Alex) Spanton from the Royal Military Police told Forces News: "We believe that her body was wrapped up in a Union Jack quilt cover. That was never found and also her shoes were never found either so if anyone has any knowledge of any of those items that would be great."
Christina's father, John Menzies, is asking the public to "please do the right thing and speak up" if they know anything that could help the investigation into the murder of his "much-loved daughter".
"You can contact the Royal Military Police or, if you prefer to stay 100% anonymous and maybe eligible for the reward, then contact the charity Crimestoppers," he said.
"There can’t be anything worse than not knowing what happened to your loved one in these circumstances.
"Our daughter never came home and 27 years on we still have no answers as to what happened or who is responsible."
A reward of £20,000 has been made available for information given to Crimestoppers which leads to a conviction.
Anyone who may have any information with regards to the investigation of the murder of Christina Menzies can contact Crimestoppers UK anonymously via phone (0800 555 111 or +44 800 555 111 outside of the UK) or using an online form on the Crimestoppers website.