Jazwell Brown has been jailed for life, with a minimum term of 39 years, after pleading guilty to murdering his partner Joanne Pearson and his neighbour Teohna Grant
They were stabbed on Christmas Day at a block of flats in Bletchley, near Milton Keynes
He was also sentenced for the attempted murder of his son and another neighbour, who both spoke outside court
Mr Justice Kerr tells Brown that Christmas will now be a "time of dread, stress, grief and mourning" for the families of the victims
The court earlier heard Brown had been smoking crack cocaine, after which he attacked Ms Pearson in an assault one survivor said was "like watching a horror film"
In a 999 call, neighbour Bradley Latter described Brown as being "crazy" after he entered their flat and attacked him and Ms Grant
Video shows Christmas Day double murderer's arrest
"I am sure you intended to kill your two murder victims," Mr Justice Kerr tells Jazwell Brown.
"Just as I am sure from your guilty plea that you intended to kill Jake Brown and Bradley Latter."
Brown has admitted the attempted murder of the two injured men.
Other aggravating features the judge is taking into account include:
Mr Justice Kerr says another aggravating feature he is considering is the ferocity of the violence.
He says the attack on Joanne Pearson "must have lasted at least six minutes" which took place while Jazwell Brown's son Jake was in the bathroom ringing 999.
"She was stabbed 31 times as well as receiving cuts and blunt force injuries," he adds.
Mr Justice Kerr explains to the court there are aggravating features in relation to the case he has to consider.
These include the use of weapons and a weapon taken to the scene of the second murder.
Jazwell Brown rubs his eyes and looks down.
Mr Justice Kerr said a whole life order "is not required" for Jazwell Brown despite the "great gravity" of his offending.
"Cases where that order is made are very rare," he said.
So he will now set a minimum term as part of the mandatory life sentence for murder.
Mr Justice Kerr continues to outline the injuries suffered by the victims.
Teohna Grant suffered cardiac arrest and "five sharp force injuries" in the attack, one of which was a fatal stab wound to the neck.
Her partner Bradley Latter was given emergency first aid in the hallway of the block of flats and suffered "multiple sharp force injuries to his scalp, neck, back and ear".
Jazwell Brown's son Jake suffered a "12cm stab wound" to his diaphragm which also injured his liver, according to Mr Justice Kerr.
He also lost the tip of his right ring finger.
"That was probably a defensive injury received while trying to ward off the knife attack and defend himself," says the judge.
Mr Justice Kerr says Joanne Pearson received 31 stab wounds to her face, neck, chest and abdomen as well as other injuries to her body including cuts.
"She had defensive injuries to her arms and hands and knife scratches that appeared to have been inflicted after death," he says.
Mr Justice Kerr says that following the attacks, Jazwell Brown left the block of flats with Tilly the dog on a lead and he was "covered in blood".
His son Jake saw him leave and went outside to warn the neighbours, the judge says.
"He will kill them all," Jake said.
Jazwell Brown is listening to the judge's outlining of events intently with his head up.
The judge continues to address Jazwell Brown and says: "The terrible crimes you committed on that day have torn apart the lives on many people.
"I have seen and heard the moving statements by your many living victims.
"Joanne's mother, Susan Pearson, has lost her loving daughter.
"Her sister Samantha is also devastated.
"Joanne was 38 when you murdered her.
"She will never see her parents, sister and large extended family again.
"Christmas will be a time of dread, stress, grief and mourning for the family.
"They are haunted by the suffering Joanne must have enudred in her final minutes."
Mr Justice Kerr is now addressing Jazwell Brown and you can watch him live at the top of this page.
He recounts that Brown had killed his partner and neighbour as well as attempted to murder another man and his son.
"You had blood on your hands literally and a blood-stained knife was on the passenger seat with your fingerprints on it," the judge says.
Jazwell Brown has reappeared in the dock ahead of his sentencing.
The hearing has resumed for Jazwell Brown's sentencing.
The judge is about to give his sentencing remarks, which will outline what prison term Jazwell Brown will receive and the reasoning behind it.
The mandatory sentence for murder is life imprisonment, but the judge will make a decision on what minimum term Brown must serve before he is considered for release on parole.
The remarks will be streamed live in this page, you can follow them by pressing Watch Live.
The court is due to reconvene at 14:00.
This afternoon Mr Justice Kerr will take into consideration statements made by the prosecution as well as the mitigating factors raised by Jazwell Brown's defence barrister before sentencing him.
Prosecutor Deanne Heer KC told the court earlier that the mandatory sentence for murder is life in prison and the judge would have to set a minimum term.
Image source, Thames Valley PoliceJazwell Brown, the Christmas Day double murderer, has been appearing at Luton Crown Court for sentencing.
This morning prosecutor Deanne Heer KC outlined that the two victims - his partner Joanne Pearson and neighbour Teohna Grant - had both suffered fatal neck wounds when Brown stabbed them on Christmas Day.
Teohna's partner, Bradley Latter, was also attacked by Brown and suffered "26 sharp-force injuries".
Ms Heer also read a statement from Brown's 18-year-old son Jake, who was also injured.
He had been in Brown's flat with him and Joanne, where crack cocaine was being smoked, and he said he heard her "screaming for her life" after he had also been attacked.
Brown, who has 10 previous convictions, fled following the attacks and he was later found with a "blood stained knife" in his car.
While in custody, Brown was heard saying he had "lost my cool" and "I don't know what happened", but during formal police interviews he made no comment.
Cocaine and cannabis were also found in Brown's system.
During this morning's hearing he was often seen looking at the floor as statements from family members of the victims were read out.
Both families said huge holes had been left in their lives while Christmas would never be the same for them.
Brown's legal counsel Charles Miskin KC said the killer was "very, very sorry" and could not understand his actions.
Here is a summary of the circumstances surrounding the attack that took place on Christmas Day last year:
Image source, Brian Farmer/BBCJazwell Brown's legal counsel Charles Miskin KC has finished addressing the court and has sat down.
The court is now taking a break until 14:00.
Jazwell Brown's defence barrister, Charles Miskin KC, says that Jazwell Brown is "very, very sorry" and "cannot forgive himself" for his actions.
"It's very difficult for him to prove remorse," Mr Miskin tells the court.
"He cannot understand why he did it, but he did."
Mr Miskin reminds the court that Brown had pleaded guilty in April to the offences.
Brown looks intently at his barrister.