The heartbroken Buckley family have said they hope her killer is "haunted" by his evil crime every day that he spends in prison.
John (62) and Marian (61) Buckley bravely put their devastation aside in order to attend Glasgow High Court as her murderer, Alexander Pacteau (21), received a life sentence.
Supported by two Police Scotland liaison officers, John and Marian sat just four metres from the hulking figure of 6ft 4ins and 15 stone Pacteau in Glasgow's High Court.
"Today's life sentence will not bring our beautiful Karen back," John Buckley said.
"Our little angel has been taken from us forever in the cruellest of ways. We mourn for her every day.
"It (the 23-year sentence) will, however, ensure that women are safe from harm from the truly evil coward who took our beautiful Karen's precious life.
"(We) hope that he is never released and spends every day in prison haunted by what he did."
The couple, from Mourneabbey in north Cork, said they again wanted to thank the people of Scotland and Ireland for their overwhelming support since the horrific events of last April.
"Marian and I would again like to thank the people of Scotland and Ireland, the Irish Garda and the Scottish Police and Prosecution service for all their help and support in bringing Karen's killer to justice," John said.
"We appreciate most especially those who keep us in their thoughts and prayers.
"We all want to move on and try to piece our lives back together.
"We have three wonderful sons and we need to be there for each other as a family."
"We would be grateful if we can now be left alone to grieve and our family's privacy be respected.
"Karen is at peace now and we know that she is in heaven looking down on us and helping us."
However, the couple said they were still traumatised by the thought of what their beloved daughter must have suffered at the hands of Pacteau.
"All Karen was doing was making her way home when she was randomly targeted and murdered by a cowardly vicious criminal," John warned.
"No words of ours can do justice to our feelings towards him. He is truly evil and we hope that he will spend the rest of his life behind bars.
"Our hearts are broken at the thought of Karen's final moments on this world. The thought of her being alone, frightened and struggling for her life, haunts us.
"The panic and fear she experienced as she fought for her very survival... but she had no chance against that coward."
"The last face she saw and the last voice she heard was of that coldblooded cowardly murderer, who calmly set about trying to dispose of her body so she would never be found."
"Not only did he rob Karen of her precious life and future but he robbed us of our beautiful daughter/sister.
"He also robbed us of Karen in death as we never got to see her, hold her or kiss her goodbye."