"This was a cold-blooded and public execution, carried out for the objective of revenge", he added.
Hord later told police: "Jodie made things very hard in my and her mother's relationship".
Mr Moulson said Hord was the ex-partner of Ms Willsher's mother, Nicole Dinsdale, and his motive was "revenge".
Prosecutor Peter Moulson QC told Bradford Crown Court how Hord stabbed mother-of-one Mrs Willsher several times before he was jumped on by members of the public who wrapped him in cling-film and restrained him with a belt before police arrived.
Many witnesses, including a child, saw the terrifying attack and fearless customers had managed to pin down the suspect in its wake until the police arrived.
Describing him as "truly and horribly rotten to the core", the judge said: 'You sentenced her, in your mind, to death'.
"You chose a time and a place to, in effect, execute; to kill; to murder".
The court heard Hord had carefully planned the killing for two weeks, placing a tracking device on Mrs Willsher's auto and obtaining a number of possible murder weapons, including a pistol crossbow.
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Sentencing Hord, Judge Jonathan Durham Hall QC said: "You are a monster, Mr Hord".
"His awful actions have devastated a family, leaving a mother without a daughter, a husband without a wife and a young girl without her mother - no sentence could ever compensate for their loss", he added.
In a statement read to the court, Mr Willsher described how Megan had been looking forward to opening her Christmas presents with her mother and the family had a trip to Disneyland planned on Boxing Day.
He admitted that he went to the store to kill Ms Willsher, and also brought an axe into the store as "back up, just in case".
Jodie Willsher's uncle, Euan Hilton said: "On the 21st December, life as we knew it changed with Jodie's murder".
Hord, who sat in the dock dressed in a grey v-neck jumper over an open necked shirt, showed no emotion throughout the hearing.
Neville John Hord, 44, of Great Horton Road, Bradford, was sentenced today (Thursday 15 March 2018) at Bradford Crown Court after he admitted his guilt. He added: "Malcolm's fears for Megan perhaps can be laid to rest".
The judge said the video was of "high quality" and "extremely distressing" and needed to be shielded from "those who take pleasure in such sadistic things".