This news item has most info on Joel Cauchi's past that I have seen/heard anywhere
Joel Cauchi: Worrying posts of Sydney mass murderer
The “disturbed” man who killed six people at a busy Sydney shopping centre posted regularly on social media pages seeking companionship and hobby tips. 14Apr24 near 11am
https://www.news.com.au/national/nsw-act/crime/joel-cauchi-worrying-posts-of-sydney-mass-murderer/news-story/80be4a0f71bfcc218830af1e393c520e
He came from Toowoomba and a neighbour termed him "disturbed"
Sky TV News quoted a neighbour using the term "schizophrenia"
I have not seen any report from Qld re him being under a doctor for treatment
