The bodies of Katie, 27, and Steven Harnett, 25, were discovered inside a home in Huddersfield on Monday morning.
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Cops confirmed both the young mum-of-four and her partner are believed to have been knifed during the horror attack.
A moving tribute has now been placed at the scene by her kids which read: “To our beautiful mummy. We love you with all of our hearts.”
Surrounded by flowers, the card was signed: “Your four precious babies xxxx.”
A bunch of carnations was also left at the scene with a card saying “for my mummy”.
A 34-year-old man has been arrested on suspicion of both murders and remains in custody.
Formal post-mortem examinations are yet to be conducted, but both victims suffered injuries caused by a bladed weapon, police revealed.
In a heart-breaking tragedy, Katie and her new partner were stabbed to death “while her kids were in the house”, according to loved ones.
Katie’s former brother-in-law said yesterday that told how his sibling dated the mum for seven years and was the dad of her oldest two children.
He said the children were “in the property when the incident took place”.
West Yorkshire Police confirmed it has referred itself to the Independent Office for Police Conduct (IOPC) following prior contact with the “parties involved”.
Tributes have flooded in for mental health nurse Katie, who had four children including a six-month-old baby.
Katie’s former brother and sister in law said the family was “absolutely devastated” as they placed flowers at the scene.
Pals said she had recently starting dating her new partner, Steven Harnett, 25, who was tragically declared dead alongside Katie.
One said: “Katie had started going out with another man, going to the cinema and that sort of thing.”
Paying tribute, another friend added: “Katie was one of my best friends.
“She was a brilliant mother and great nurse carer for the mentally ill.
“I’m heartbroken for her and her four kids – the littlest boy is only six months old.”
While one pal wrote: “RIP my gorgeous!! You made me laugh when I needed to laugh and you were such amazing mum to the kids and amazing person!
“Don’t know how I’m going to carry on without seeing your kids, having a conversation with you or even our funny dances!!
Soo sorry gorgeous you were taken too soon!!
“Your kids will be looking up at you I promise!! Love you lots missy! And will miss you so much!!
“Rip to the man as well he didn’t deserve it.”
Tributes have also poured in for Steven who had a “heart of gold”.
A friend of the dad said: “RIP Steven I will always make sure your daughter knows who you are.
“You loved her with all your heart and I will always make sure she knows she is daddy’s favourite girl.”
Cops raced to the property on Harpe Inge just before 10am on Monday.
Katie and her boyfriend were found inside with multiple injuries after the “exceptionally serious” attack.
Their deaths sparked a major police manhunt, with armed officers raiding several addresses looking for a suspect.
Detective Superintendent Marc Bowes of the Homicide and Major Enquiry Team, said: “This has clearly been an exceptionally serious offence and I can promise residents that a full investigation is ongoing into the murder of this man and woman.
“We are conducting extensive enquiries at the scene and at other locations in the Dalton area as we investigate the circumstances of what took place.
“I am appealing for anyone who saw suspicious activity overnight or this morning at the property on Harpe Inge to contact us.
“Residents in the nearby area will also note an increased police presence on their streets and I want to reassure them and the wider community we are doing all we can to bring persons responsible for this offence to justice.”
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