Corey Dryden killed mum-of-two Megan Hughes after violently assaulting her with weapons at their home in Chirnside, near Duns, on 9 February 2025.
Instead of calling the emergency services to help Megan, the 32-year-old waited more than two hours before eventually dialling 999.
Dryden earlier pleaded guilty to a charge of murder, an offence which was aggravated due to it involving the abuse of a partner.
The court heard how Dryden had previously been abusive towards the 31-year-old victim by shouting and calling her names in the lead up to the domestic homicide.
Dryden was ordered to serve a minimum of 18 years in custody when he appeared for sentencing at the High Court in Edinburgh on 24 July 2025.
Moira Orr, who leads on homicide and major crime for the Crown Office and Procurator Fiscal Service (COPFS), said:
“Corey Dryden is a violent and dangerous man who murdered Megan Hughes in her home, where she had the right to be safe.
“After subjecting her to a horrific assault, he left his partner on the floor to die instead of calling for help.
“His cruel and callous actions have robbed Megan of her future and left her family and loved ones to deal with this unimaginable loss. Our thoughts remain with them.
“Dryden has now been held accountable following this prosecution, which should send a clear message to perpetrators of domestic abuse.
“We will use all the tools available to us to seek justice and ensure that those responsible face the consequences of their actions.
“Violence against women and girls is a blight on our society, and I would urge anyone affected to report it to the police when they feel ready and able to do so.”
Police Scotland Detective Chief Inspector Laura White added: “This was a vicious and calculated attack by Dryden that tragically resulted in Megan’s death.
“His actions have robbed a family of their mum, daughter, granddaughter, sister and niece.
“Our thoughts very much remain with Megan’s family and friends as they come to terms with what happened to her."