Broadcaster Ray Hadley, a close friend of businessman John Singleton, says he was forced to break the tragic news to his friend that his daughter had died in a mass stabbing attack at Bondi Junction.

Dawn Singleton, 25, and five others were killed during the stabbing rampage at the busy shopping centre on Saturday afternoon.

WATCH THE VIDEO ABOVE: Ray Hadley on Westfield Bondi Junction mass stabbing.

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Dawn’s father, multi-millionaire businessman John Singleton, was told of the tragedy by close friend Hadley after he contacted him on Saturday night, to confirm if his daughter was among those injured.

“I rang him, and he said, ‘I think my Dawnie is one of those who lost their lives and I can’t confirm it. Can you do something?’” Hadley said on 3AW radio.

The radio host says he then called NSW Police Commissioner Karen Webb, desperately searching for an update.

“I rang the police commissioner and asked her if she had any names, and she said only one and confirmed it was Dawn,” Hadley said.

“And I had the job of ringing John back and unofficially confirming that his dear darling daughter had been stabbed to death by this lunatic.”

Queenslander Joel Cauchi, 40, stabbed six people to death and seriously wounded 12 others in a killing spree before being shot dead by NSW Police Inspector Amy Scott at Westfield Bondi Junction on Saturday afternoon.

Among those killed was 38-year-old osteopath Ashlee Good, whose nine-month-old daughter was also injured during the mass stabbing and remained in intensive care on Sunday after undergoing emergency surgery.

The others that have since been identified are 38-year-old osteopath Ashlee Good, 25-year-old daughter of multi-millionaire businessman John Singleton Dawn Singleton, security guard Faraz Tahir, mother-of-two Jade Young, 55-year-old Pikria Darchia, and Chinese national Yixuan Cheng, aged in her early 20s.

Cauchi’s estranged family issued a statement through Queensland police on Sunday, declaring they were devastated by the traumatic events and expressing sorrow for the victims.

“Joel’s actions were truly horrific, and we are still trying to comprehend what has happened,” it read.

“He has battled with mental health issues since he was a teenager.”