Explosive new documents from the William Tyrrell case have shed new light on the toddler's troubled final days with his foster family, his violent behaviour and a 'distressing' accident before he vanished.
Exclusively obtained by Daily Mail Australia, the interviews with William's foster family reveal troubling details about the three-year-old's short life.
They include an accident where William fell off a stool and couldn't get up, how he was made to change his own dirty nappy on the day he vanished and queries about the foster father mysteriously deleting six weeks of texts with his wife.
William's foster mother - who is currently facing assault and stalking charges of a child who isn't William - admitted that initially William 'had personal issues .... particularly towards me'.
'We had to deal (with) things such as William hitting me, biting me and him being basically furious' with another child in the foster parents' house.
The foster mother, who said the other child would 'hide under the table and not come out, throw tantrums' blamed William's violent and 'very erratic' behaviour on his birth parents, who still had access visits.
'The initial period when William first started living with (us) was very difficult. William had ... disrupted attachment issues back to his birth parents.
William Tyrrell's foster mother (above) said when the boy came to live with her he was 'hitting me, biting me' and was 'basically furious' and she blamed William's birth parents for his unsettling behaviour
The foster father was interviewed by police at Port Macquarie two days after William vanished from Kendall, and again in 2016 when he theorised that mystery abductors might have bugged his car
William hit and bit his foster mother when he went to live at the foster couple's North Shore home where in the days before he vanished he fell off a stool and 'couldn't get back up'
'(William was) very unsettled, particularly the time immediately following contact with (his) birth parents. The unsettled behaviour after visits would last months.'
This was despite, as the foster father revealed in a police interview, that immediately before taking in William they had wanted to 'help a family' and then 'there was a scenario that came up and the Department even said "you'd be perfect for".'
'It all fitted into place, I mean the ink wasn't even on the paper. It's like going from zero to hero.
'It was very, very tough but we managed it .. and when I met William, you know, it was like he was mine.
'I was his world, he was mine.'
But Daily Mail Australia can reveal for the first time the contents of the foster father's first police interview, conducted just two days after the toddler vanished, in which he admits a 'distressing' incident.
The foster mother's markings of where she, the foster grandmother and William Tyrrell were on the driveway of the house just after 9am on the morning the boy vanished
William Tyrrell's foster mother blamed the toddler's disruptive behaviour and 'personal issues ... particularly towards me' on the fact he was still having contact with his birth mother (left) and father (right)
William was a 'non-stop' child and the foster father told detectives at Port Macquarie police station on September 14, 2014 about a recent incident at home on Sydney's North Shore.
'Only in the last week or so he was, you know when you've got the little stools that they stand on.
'So he was sitting next to one or on one in the kitchen in our place. And he'd somehow managed to sit awkwardly and fell back.
'But he couldn't get back up, which is something that has distressed me a bit.
'If he's fallen and he's fallen backwards, that seemed to indicate to me that he had a problem with getting back up.
The foster parents stop with William at McDonalds on the evening before he vanished from his foster grandmother's house at Kendall the following morning
William Tyrrell was 'non-stop' active and around a week before he vanished from Kendall he fell over and the foster parents' Sydney home and was lying 'awkwardly' and 'couldn't get back up'
The foster father, (above) with a detective on a 'walk through' of the property where William was last seen, told police abductors in two cars could have targeted the toddler
'You've got the stool like that. And he was lying over it so it, it's quite and awkward thing.
'And I think for a boy that size and age would find that a little bit awkward... I mean if eventually I wasn't there he probably would have got himself out of it by just rolling.
'But they don't think about those sorts of things. They think oh, I'm in a position I can't get out of - and daddy, daddy's here and daddy, daddy.
'So you know you help them up and he's all fine.'
In the interview, the foster father describes waking up on the morning of the day William would go missing, Friday, September 12, 2014.
He said both he and William stirred inside the room they were sleeping in together at about 5.50am.
'He always wakes up and he says, oh, you know I've had an accident, you know, he wets his... because he still wears ... pull ups.
'But for some reason he always manages to fill them. And I said are you wet and all that sort of stuff and I said, okay well then you need to go , get up first and you need to get changed first okay and then we know and we can have a cuddle.
Police use luminol and a blue light to look for blood traces at the front garden of the former home of William Tyrrell's foster grandmother in Kendall in November last year
The foster grandmother's home (above, being searched by police last November) was being readied for sale and that was the reason for William's foster parents'
