The 30-year-old, who had diagnosed bipolar, had asked his mother Lilla to come to the John Coutts Reserve in Melbourne’s north on the afternoon of July 16, 2020.
When she arrived, Gabriel pushed her to the ground and hit her, repeatedly stabbing her head and neck with a wooden stick.
After 17 minutes, police arrived and one of the constables fired three shots at Gabriel’s chest, killing him.
His mother was taken to hospital with life-threatening injuries after she went into cardiac arrest four times.
Messo survived the attack but now lives with an acquired brain injury.
State Coroner Judge John Cain on Tuesday began investigating the circumstances surrounding Gabriel’s death.
The Victorian Coroners Court was told Gabriel was diagnosed with bipolar disorder in 2014 after he experienced his first episode of psychosis.
Over the years, he went through periods where he stopped taking his medication and experienced delusions, telling his friends he needed to “cull” people because he was on a mission from God.
On July 15, the day before his death, Gabriel was arrested after an incident at his aunt and uncle’s property.
He was taken to hospital under police guard as he appeared he was either drug-affected or in a psychotic episode.
Gabriel was deemed fit for interview and discharged to the Broadmeadows Police Station later that day before he was released on bail.
The 30-year-old attacked his mother at the John Coutts Reserve the next day.
An autopsy found there were no drugs or alcohol in his system at the time of his death.
Counsel assisting the coroner Ben Ihle QC said the inquest would look at Gabriel’s mental health treatment, his arrest on July 15, and the actions of Victoria Police.
Nineteen witnesses including police officers, nurses and family members will give evidence in the inquest, which is expected to run for nine days.
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