The judge told Brian Lewis that Hayley Jones did nothing to provoke him
A man who killed his partner after she changed her status on Facebook to "single" has been jailed for life.
Mother-of-four Hayley Jones, 26, was found dead by her young children days later in March 2007. She had been stabbed and strangled.
Brian Lewis, 31, of New Tredegar, Caerphilly county, had denied murder and said he did not plan to kill her.
The judge at Cardiff Crown Court said Lewis had been "frustrated, angry and hurt". He must serve at least 14 years.
After the case, Hayley Jones's mother, Sally Williams, 50, said the murder had turned their lives upside down: "The murder conviction and sentence can never replace the loss of my beautiful daughter.
"She was a devoted mother to her four children. She had recently started work to provide a life for her and her family.
"As she lay asleep she was cowardly attacked and left for dead and left to be found by the children, Jordan, Cory, Kian and Tia.
"Her days of seeing her children growing up and possibly being a grandmother have been cruelly taken away from her, although Hayley is no longer with us in this life."
Judge Mr Justice Roderick Evans said: "There was no provocation - this arose because you were frustrated, angry and hurt. You had been building up your anger.
"She did nothing or said nothing which could have acted as a trigger for this."
Lewis used a kitchen knife to stab his partner of 13 years through three layers of clothing and two sleeping bags.
Lewis, who is known as Charlie, then fled the house while two of their children were standing at the top of the stairs listening to the row.
Son Kian gave video evidence to the trial on how he heard his mother screaming: "No Charlie, no Charlie, I love you."
The jury heard that Kian heard his father call the police to say: "I have killed my girlfriend."
Kian, who was with his brother Jordan, seven, said: "Then it all went quiet."
He said he called out and there was no answer so they went downstairs "and saw mam lying on the floor".
"There was blood in her mouth and on her T-shirt. I was pushing her but she wouldn't wake up," he said.
Prosecutor Mark Evans said: "Hayley started to expand her social life and was spending a lot of time on internet sites in particular Facebook.
"She was quite secretive about this, preventing Lewis from using the site and turning the computer off.
"It is quite clear this rankled with him.
"On March 2, she changed her Facebook relationship status from married to single and she made it clear their relationship was over.
Mr Evans said: "Lewis had lost his job and this caused a downward spiral and family finances were strained.
"Hayley took up work as a care assistant - before that she was devoted to bringing up their four children."
Mr Evans said a week after she changed her profile Lewis was heard telling drinking friends he would kill her before anyone else had her.
Lewis killed his partner on 12 March, 2007.
He then dialled 999 and told police to come before fleeing the scene, leaving the children to find their mother's body.
He later gave himself up to police.
Det Ch Insp Russ Tiley of Gwent Police said: "The children and family of Hayley have been very brave through this process and hopefully will now have some closure."