The same morning her three-year-old boy disappeared without a trace, William Tyrell's mother spotted two cars parked across the road.
The cars - a white station wagon and older-style grey sedan - were parked close together on the street where William's grandmother lived, and had their driver's windows down.
William's mother thought it was strange, but could have never thought it would become part of the investigation into the disappearance of her boy.
Police revealed they want to speak with the drivers of those cars, in a special report on the Nine Network's 60 Minutes.
Detective Inspector Gary Jubelin said it didn't make sense why the cars were parked in the dead-end street between two large properties in the small NSW town of Kendall, and not in a driveway if they were visiting people.
"There's no logical explanation why they would park where they were," he said.
William would be four years old now had he not gone missing from his grandmother's backyard on September 12 last year.
For nearly a year, the parents of the missing child have relived that day over and over again.
His mother revealed how moments before, he had been playing on the patio in his favourite two-piece Spider-Man suit when he jumped off and went around the side of the house.
His playful roars were the last sound she heard.
"I can still hear him," she said. "He was roaring and then nothing.
"The world just came to a screaming halt. There was no wind, there were no birds. There was just nothing."
In the past year, police searching for William have created more than 5000 documents, tabled in excess of 1400 information reports (mainly from the public), interviewed more than 1000 people and have had more than 407 sightings of children believed to be William.
Investigators believe William, who was waiting for his dad to arrive back at the home, may have run down toward the road when a pedophile saw their opportunity.
"Those two worlds colliding - it's like evil meeting innocence," Det Insp Jubelin said.
He and the family have appealed to anyone who might be suspicious of a loved one or friend.
Two grandparent support groups have also reportedly been looked at as part of investigations.
Grandparents as Parents Again were interviewed by police a "long time ago" and don't have anything to do with person of interest Bill Spedding, the group's chaplain Alan Battishall told Fairfax Media.
The Grandparent and Kinship Care Association has also reportedly come to the attention of investigators.
The public, like police, have refused to give up.
A Where's William week will be launched on September 12, the exact date of his disappearance. It's supported by child protection advocate Bravehearts, the NSW police and about 560 councils across Australia.
"As far as we're concerned, William is alive until we know otherwise," a Where's William campaign spokeswoman told AAP.
* Anyone with information should call Crime Stoppers on 1800 333 000
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