The mother of Amy Leigh Barnes branded her killer Ricardo Morrison a "monster" as he was jailed for life.
Karyn Killiner, 41, an art teacher, said Morrison, 22, of Birmingham, wormed his way into the family's affections after meeting her daughter - and subjecting her to months of abuse.
"I want the world to know what he is like," she said. "He was a conman and he integrated himself in our family. He was charming and said how much he loves you.
"But the other side of him is controlling and he had complete power over Amy and all her actions. He is an absolute monster and no language can describe him."
Mrs Killiner described Miss Barnes, 19, an only child, as a "little treasure" and a wonderful daughter.
From an early age the part-time model and actress loved singing and performing and grew up to make her parents proud.
"We were proud of the beautiful person that she was inside and out," her mother said. "She was vibrant and constantly making us laugh. She used to work so hard, going for castings and auditions.
"She would come home after working at a pharmaceutical company and be on the computer applying for roles and castings."
Morrison met Miss Barnes through the Facebook website in February last year and they soon began dating.
Miss Barnes, who had dated a number of professional footballers, said she liked Morrison because he was a "normal boy" and he soon moved up to Bolton to live with her at her mother and stepfather's house.
But Morrison's true character soon showed itself.
"At first he was very charming and kind and he would write us letters to say thank you for letting him stay," Mrs Killiner said. "He said we were like a mother and father to him and that we gave him a home when he needed one.
"We could see that there were a few arguments but nothing that worried us. We thought it was normal as they were a young couple learning to get along together.
"We went away in July and at that time we felt confident that we could leave them both at home to look after each other and the dogs. While we were on holiday was the first time when I knew something was wrong.
"At 5am we were in Italy and got a phone call and he was screaming down the phone at me and said to get Amy to call him. I tried to reassure him but he put the phone down on me. I phoned Amy and she told me there had been an incident the night before when they were out in Bolton and he assaulted her.
"He was abusive to her and the police were called but she said do not worry because she was safe. The police came and said they needed to speak to her because he had been abusing emergency services staff down the phone. He was arrested and was in hospital for a bit."
Miss Barnes's father, Andrew Barnes, 41, who split from her mother when their daughter was 10, added: "He was very polite and respectable. I called her my princess and he said that he would look after her.
"I would pick her up in a morning and drop her off because she worked near my garage.
"But every time she got in the van he would be ringing or texting her, asking where she was. I told her that at 19 she did not need the hassle and thought she was working up to getting rid of him and getting him out of her life.
"I said to her that if he has shown violence to other women that he would do it to her, too, but she denied it and said he wouldn't hurt her.
"We were aware that the relationship was not healthy but did not realise the potential of what he could do."
On the day their daughter was murdered, Morrison had gone out and locked her in the house but she called her mother begging to come home.
Her parents set about rescuing her - but Morrison arrived back at the house just minutes before them and her father discovered his daughter dying in a pool of blood.
Mr Barnes, who runs his own business, said: "Walking through the door was the hardest day of my life. No one should have to see that, not their little girl.
"Since then it has been a living nightmare. I just think if I had been 10 minutes earlier, this might not have happened. I thought at first that she had fallen down the stairs but then I saw all the blood coming from underneath and realised that this was serious.
"When the doctors told me she had died I felt like someone put their hand in my chest and ripped my heart out of my chest."
Mrs Killiner said: "I got a call from Amy and I knew there was something wrong.
"She said 'please will you come and get me, mum?'. I said 'yes darling'. I could tell she was frightened and she started to cry.
"As soon as I got to the hospital I ran in and I could hear Amy screaming, I knew it was my child. I said I need to see my daughter but they were frightened of me seeing her. I heard the detective say to the staff 'she doesn't care what she sees, she wants to be with her daughter'.
"But nothing prepared me for what I saw. Her injuries were horrific and what he had done to Amy's beautiful face - I knew that was to completely disfigure her.
"It was such a personal attack to Amy, and to me. She could not have lived with those injuries. I tried to touch her and stroke her and she was screaming so much.
"I turned to the medical staff and asked 'is she going to be OK?'.
"I said 'please do not let her die' but he could not speak to me and just shook his head. They took Amy to theatre and just before they gave her the injection to sedate her, she screamed 'I want to die"' and that was the last thing she said.
"I knew that's what she wanted because I knew she could not take it any more.
"She was minutes away from walking out of that house, but knowing what we know now, I think he would have hunted her down and got to her eventually. He would never have let her go. If he could not have her, he would destroy her."
Despite overwhelming evidence, Morrison would not admit his guilt - forcing her family to relive her dying moments by giving evidence in his trial.
"It was very difficult to see him in court," Mr Barnes said. "He stared right at me when I was giving evidence. It is a good job he was in a glass cage."
Mrs Killiner added: "I did not look at him at court. I could not even look at the prosecutor because I feared that I would see him behind.
"I was doing it for Amy but I knew that it did not matter what I did, it would not be enough to bring her back, but the truth had to be told because I do not want him to hurt another woman.
"If it was not me standing there, it would be another mother. It does not matter how many years in prison he gets, it will never be enough."
* A Facebook tribute group to Amy can be found here.