The WA police commissioner has admitted murdered mother-of-two Lynn Cannon was “let down”, after it was revealed officers took an hour and 15 minutes to reach the domestic violence victim following multiple calls to triple zero.

Her husband, Paul Cannon, was arrested at the scene and later convicted of her murder, having stabbed his estranged wife several times.

Lynn Cannon murder - sentencing delay and police probe into response time
Lynn Cannon’s killer was due to be sentenced on Wednesday but to the disappointment of family and friends wearing Lynn’s favourite colour to court, it was postponed by the judge, who needed more time to consider the case. (9News)

“The fact that it took police so long to get to that killer callout is not acceptable,” Premier Roger Cook said on Wednesday.

Police Commissioner Col Blanch said: “There are always people in need – but this time Lynn was let down and Lynn died.”

Late on Wednesday afternoon, WA Police Minister Paul Papalia was probed over the response time.

“I’m sure that the matter in question will be subject to a coronial inquiry,” he told state parliament.

Lynn Cannon murder - sentencing delay and police probe into response time
Officers took an hour and 15 minutes to reach domestic violence victim, Lynn Cannon, following multiple calls to triple zero. (9News)

The 55-year-old killer was due to be sentenced on Wednesday but it was postponed by the judge, who needed more time to consider the case.

This news came to the disappointment of

Family and friends who attended court wearing red — the mother-of-two’s favourite colour — were left disappointed.

“We’ll be back here on Friday, to get that — to get justice for our beautiful little sister,” Lynn’s sister Jacqueline Darley told reporters outside the court.

“We’re disappointed we didn’t get everything finalised today but the main thing is they make the right decision.”

Lynn Cannon murder - sentencing delay and police probe into response time
The state prosecutor described how Paul Cannon stabbed the 51-year-old (pictured) seven times with two kitchen knives (9News)

A packed courtroom heard how the abusive husband grew jealous when discovering his wife’s new relationship two years after she left him.

The state prosecutor described how Paul stabbed the 51-year-old seven times with two kitchen knives, yelling: “I told you I was going to kill you”.

The 55-year-old murderer was crying and trembling as the court heard his landlord witnessed the attack.

Lynn’s family will be back at the Supreme Court on Friday to learn the murderer’s fate.

He’s been in custody since December.

If you or someone you know is impacted by sexual assault, domestic or family violence, call 1800RESPECT on 1800 737 732 or visit 1800RESPECT.org.au.

In an emergency, call 000.

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