Police have released the last known footage of Lisa Dorrian ahead of the 20th anniversary of her disappearance.
It came as the family of the missing woman also made an emotional plea as they start a new digital billboard and bus shelter campaign across Northern Ireland.
The PSNI also made a fresh appeal for help in solving one of Northern Ireland’s longest and most high-profile missing persons cases.
A £20,000 reward from the independent charity Crimestoppers was also announced today.
The 25-year-old was last seen alive on the night of February 27, 2005, at Ballyhalbert Caravan Park in Co Down.
Police believe she was murdered that night or in the early hours of the following morning.
The last known footage of Lisa in the days before her disappearance
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The footage shows the missing woman entering a Newtownards pub, the Saltwater Brig near Kircubbin, on the afternoon of February 26, 2005.
This is believed to be the last known footage of Lisa in the days before her disappearance.
Still image 1: Shows Lisa enter the Lock & Quay, Groomsport, in County Down (now Groomsport Inn) on the night of Friday 25 February 2005
Still images of Lisa entering and leaving the Lock & Quay (now the Groomsport Inn) in Co Down on the night of February 25, 2005 were also released.
Detective Chief Inspector Kerrie Foreman, from the PSNI’s Major Investigation Team, said: “Lisa Dorrian was a young woman – just 25 years old – when she was murdered.
“Lisa, who was from Bangor, was last seen alive on the night of Sunday February 27 2005 at a party in Ballyhalbert Caravan Park. It’s believed she was murdered that night or in the early hours of the following morning.
Lisa Dorrian went missing from a Co Down caravan park in 2005
“Despite hundreds of extensive search operations and thousands of lines of enquiries completed, Lisa’s body has not been found, and those responsible for her murder have not yet been held to account.
“Twenty years have now passed. That’s 20 long years of unimaginable torment for a loving family. Yet, despite their pain, they’ve never given up their search for answers and, likewise, our determination has remained steadfast.
“We’re releasing CCTV footage, along with still images.
“This is the last known footage of Lisa in the run-up to her disappearance. My hope is to jog memories, and to encourage anyone with information to speak up.”
Missing Co Down woman Lisa Dorrian (Police Service of Northern Ireland/PA)
Detective Chief Inspector Foreman continued: “Lisa wasn’t just a name or an image on a photo or screen.
“She was a real person – a young woman with a family that love and continue to miss her dearly. They deserve to know what happened to her and they deserve justice.
“Those who have information, but who are reluctant or frightened to come forward, must surely have a troubled conscience.
“I am asking you to take this opportunity to do the right thing and speak up. Keep in mind that two decades have now passed.
“People’s circumstances may have changed, and allegiances may have changed.”
Still image 2: Shows Lisa leaving the Lock & Quay, Groomsport, in County Down (now Groomsport Inn) on the night of February 25, 2005
She added that information can be passed on with “100% anonymity” to independent charity Crimestoppers.
The charity is also offering a reward of up to £20,000 for information given directly to them which leads to an arrest and conviction, or information that results in the recovery of her body.
Lisa’s family also issued an emotional plea ahead of the 20th anniversary of her disappearance.
Reading a statement on behalf of the family her sister, Joanne Dorrian, urged anyone with information to come forward.
“Twenty years ago, we lost our beautiful sister and daughter but, even more importantly, Lisa lost her life at the hands of people she knew and trusted,” she said.
“Every day without Lisa is hard, but 20 years has been a lifetime of pain for us.”
She added: “Lisa had dreams and aspirations, she wanted to get married one day and have children of her own.
“She was a vibrant person who always wanted more from life – she wanted to travel and explore the world. Lisa was denied all of her hopes and dreams.
“Since Lisa was murdered we have had family celebrations, birthdays, births and deaths and have felt the loss of Lisa at every single one.
“We talk about her to her nieces and nephews so that they will know what a loving auntie they would have had. Her absence in all of our lives has grown over the years – all of the ‘what ifs’ and ‘if onlys’.
“On the night that Lisa was murdered she would have laughed and joked with these people. She would have been her loving, kind, funny self.
“She would never have imagined that they would have caused her harm, murdered her and then decided to put her body somewhere so that it would remain hidden for 20 years.”
Joanne added that the family has “never been the same” since her sister’s disappearance.
She added their mother had died never knowing what had happened to Lisa.
Joanne the sister of Lisa Dorian pictured at press conference on the Anniversary of Lisa’s disappearance at police headquarters. Credit: Presseye
Pat Dorrian died in December 2015, over a decade after her daughter went missing.
Last year Lisa’s name was added to her mother’s headstone.
“The grief and pain was all consuming. Our lives have to go on around what happened to Lisa but she is at the heart of all of our thoughts and conversations daily,” she said.
“We are grateful to have an active PSNI investigation with a team intent on getting justice for Lisa.
“We hope to see Lisa’s murderers in court one day.”
Joanne said that the family will later today gather a memorial park bench which was put in place at Castle Park in Bangor.
“Lisa will never be forgotten and we will campaign until we find her and get justice for her murder,” she said.
“We will also visit mums grave where Lisa’s name was added last year and lay flowers in the hope that one day we will be able to give Lisa the Christian burial she deserves.
“Twenty years of secrecy could end with a phone call, a letter, a message. Please tell us where Lisa is.”