A terrified teenager bravely called 999 after discovering her mum's body while the killer was still in the house.
Wiktoria Bartnik, 16, rushed to call emergency services in a hushed voice after she noticed her mum had vanished from her bed.
Killer Piotr Cichy had fatally battered and smothered Magdalena Pacult, 46, in a violent outburst at their home in Custley Hey, Stockbridge Village, Liverpool.
After daughter Ms Bartnik found Ms Pacult's body, her quick-thinking led her to make the call and alert the police without Cichy finding out.
Officers arrived within six minutes and placed guards at the front and back before knocking at the door, reports Liverpool Echo.
The 49-year-old murderer was then escorted to the kitchen when he eventually answered.
Ms Pacult had taken refuge in her daughter's bedroom the night before and the pair talked into the early hours of New Year's Day of this year.
But when Ms Bartnik woke up, at around noon, her mum was no longer beside her.
The teenager found her mum's body on her bed and made a terrified call to police.
When officers arrived they found Ms Pacult's body and her partner Cichy was arrested.
The liar denied he killed her throughout the court trial - claiming someone else had got into the house and committed the murder.
But investigators discovered evidence he often been violent to Ms Pacult during their two year relationship.
It also emerged he had gone round to the home of some friends shortly after the murder with a bag containing his bloodied pyjamas and told them that he had killed Ms Pacult.
During the trial, Gordon Cole, QC, prosecuting, told jurors that prior to her death Ms Pacult sent a number of texts relating to the defendant.
In one message she said: "I must escape from the house, he drinks and gets aggressive."
In a different message she said: "He keeps threatening me, calling me names, making me feel scared.
"He keeps the key, he sleeps with them. I can't change the lock because I'm unable to do it."
A jury at Liverpool Crown Court today unanimously convicted Cichy of murder.
He will be sentenced on September 24.
Senior Crown Prosecutor for the CPS, Angie Rowan, said: “Piotr Cichy is a violent bully who subjected Magdalena Pacult to abuse throughout most of their relationship.
“He had a problem with drink and the violence towards Magdalena got worse when he drank. She had taken refuge in her daughter’s bedroom in the hours before she was killed.
"The details of what happened between her and Cichy in the hours leading up to the killing will probably never be known but the results of it were devastating.
“The Crown Prosecution Service applied to the court to allow Ms Pacult’s daughter to give her evidence prior to the trial away from the court to make the process less upsetting for her.
“These provisions are relatively new and allow for the evidence and cross-examination of a young or vulnerable victim to be pre-recorded and then shown to the jury during the trial.
“Ms Bartnik has already suffered a dreadful tragedy. We hope that the provisions we have made for her to give her evidence in this way and the successful conclusion of this prosecution will go at least some way to helping her in the months and years ahead.
“The Crown Prosecution Service would like to pay tribute to her courage in helping us bring this prosecution.”