The father of murdered schoolboy Luke Batty threatened him with a knife almost a year before he stabbed the 11-year-old to death, an inquest has heard.
In Feb 2014 Luke Batty died at the Tyabb cricket ground south-east of Melbourne after his father, Greg Anderson, hit him with a cricket bat and stabbed him as he lay on the ground.
The attack occurred in front of other families, including the 11-year-old's team-mates and their younger siblings.
The only eyewitness was an eight-year-old boy, who ran over and told his father what happened. The father called triple-0.
When ambulance crews arrived on the scene Anderson would not let them get near the boy.
Police tried to subdue him with capsicum spray but when they were unable to, he was shot as he lunged at officers with a knife.
He later died in hospital.
The inquest, before Victorian State Coroner Ian Gray, will consider what was known about Anderson, and by whom, before he killed his son.
At the time Anderson killed Luke, police had four arrest warrants in his name, and several intervention orders, including one to protect Luke and his mother, Rosemary Batty.
But Ms Batty was not told about the arrest warrants, or an intervention order taken out against Anderson by a housemate.
Rosie Batty not told about her husband, Greg Anderson's child porn charges
Giving emotional evidence at today's inquest, Ms Batty said she also had not been told about child pornography charges laid against Luke's father.
When asked if she would have liked to have known about the charges, Ms Batty said one police officer told her he would love to pass on the information but was forbidden from doing so.
She found out later during a court appearance in July 2013.
"I was the primary parent," she said.
"I was already challenged to my limits about what I should and shouldn't be doing with regards to Luke.
"Would any parent want to know? Of course, anybody would want to know."
The inquest heard Anderson was supposed to only see him at the cricket ground on weekends.
But on the day he died, his father turned up unannounced.
Ms Batty said she had to call police to the cricket ground on other occasions and considered calling triple-0.
But she said it was a "nice night" and Luke's father seemed happy to see him, and not agitated.
"I didn't trust the situation," she said.
But she said it would have been "the third time I've tried to get that man arrested in front of Luke and his friends, at that bloody oval".
She continued: "I said (to Luke), 'will you be alright'? "He said, 'yeah, I'll be alright Mum'."
'I could no longer support his relationship with Luke': Rosie Batty
Ms Batty said she had tried hard to include Anderson in her son's life.
"Greg was really keen to be involved... there was never any doubt in my mind that I should set aside animosity," she said.
"I said to myself, 'this is a journey and I'll keep doing things that feel right until they don't feel right anymore'.
"As he got older... it was a constant test to decide... [Anderson] was constantly stretching the boundaries. I really struggled with that boundary, to tell him he couldn't see his son."
"It was really hard to say no to him... nobody understood that."
Ms Batty said she "knew something had changed" when Luke told her about an incident in the car one day when they were alone.
The inquest heard Anderson had held a knife up in front of Luke, and said "this could be the one that ends it all", and that Luke felt threatened.
The incident occurred in April 2013, 10 months before Luke's death.
"I didn't understand the context," Ms Batty said.
"But I knew I could no longer support his relationship with Luke. I knew something had changed."
Ms Batty broke down several times as she was asked to describe her son, and their relationship.
"He was everything... he was my only son, my only child," she said.
"He was the centre of my life... I made every single decision for him."
"I'm still trying to do it but I can't get him back... I never want anyone to be sitting where I'm sitting and to have lost their son, because I can never get him back."
The inquest continues.