Joel Cauchi is revealed to have stalked other shopping centres and Googled 'how ... trends now
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The Westfield Bondi Junction knifeman had reportedly researched killing and stalked other shopping centres before his stabbing spree.
Joel Cauchi, 40, fatally stabbed six people and injured at least 12 more in a violent rampage at the busy Sydney shopping centre on Saturday afternoon.
The killer's distraught family have spoken about his long battle with mental illness and his obsession with knives.
His mother, Michele, said on Monday that her son was 'obviously not in his right mind'.
'He somehow had been triggered into psychosis and he'd lost touch with reality,' she said.
But now it has emerged Cauchi's rampage may not have been a spur-of-the-moment attack and he may have been planning it for weeks.
Joel Cauchi (pictured), 40, fatally stabbed six people and injured at least 12 more in a violent rampage at the busy shopping centre on Saturday afternoon
He had reportedly researched killing and stalked other shopping centres before his stabbing spree
Cauchi had been googling 'killing' before the attack.
'I have learned today that the investigators have been able to download data from his phone, which has indicated that he
