The man who killed six people and injured more shoppers at a Sydney mall on Saturday appears to have had a fixation on knives.
Joel Cauchi stabbed 17 people, 14 of whom were women, at Bondi Junction Westfield.
Video shows him chasing victims with a large blade.
The rampage comes after the 40-year-old called Queensland police alleging "domestic violence" against his Toowoomba-based father last year for hiding his knives from him, according to The Australian.
The news outlet also spoke to a knife-sharper who had serviced his knives but got a harsh review about their sharpness after the visit.
The business owner, who didn't want to be named, described Cauchi's "really blank personality".
"Nothing angry, distorted, nothing like that," he said. "He wasn't happy, he didn't smile. He was just very vague, very blank.
"The customer I was dealing with at the time actually was there as well, and even she said, he's odd… She said, 'he's a little bit weird'."
The knife-sharper said Cauchi came in to have his hunting knives honed, saying he "uses them every day in the house".
"A pig sticker (about 25cm long), and the other was another type of hunting knife, probably about eight inches long," he said.
But weeks after the service, Cauchi left a scathing 1-star review on the company.
"I put in two knives (one of which is pretty expensive) to be sharpened and he blunted them both," he wrote.
"I made sure that I clearly, repeatedly and correctly gave all instructions when I put them in and he blunted them, then was very unhelpful afterwards, either being unable or unwilling to fix the job, leaving me with two blunt knives that are basically useless now."
Cauchi left other reviews, including at strip clubs and a brothel.
"I really loved this place! The girls were incredible and the place itself looked very nice! The staff were awesome, really friendly, and it was a great experience!" he said of Banksia Brothel in Sydney.
The Daily Mail has reported the attacker had profiles of his own on various escort websites, where he offered services for both men and women.
The outlet said he was listed on several male escort websites, including Australia Cracker, Empire Escorts and Escorts Australia. All websites allow users to upload their own pictures and solicit their own sexual services.
