An inquest into his death and the deaths of two hostages at the end of the 16-hour siege, is probing Monis' motivations -- including whether he was a "lone wolf" prosecuting an IS-inspired terrorist act or a deranged individual.
    
It was told that Monis had mental health issues and at times believed he was under constant surveillance by security agencies in Australia and Iran.
    
Monis was referred to a psychiatrist in May 2010 after he ended up in hospital complaining of dizziness.
    
"He was very evasive in his answers -- he felt that he was being watched all the time, even in his bathroom," psychiatrist Kristen Barrett, who first saw Monis that May, told the court.
    
"My impression was that he had chronic schizophrenia and my treatment plan was to start anti-psychotic medication," he said.

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