In an exclusive interview with Melissa Doyle to air on Channel Seven's Sunday Night, William’s mother Karlie Tyrell opens up about her missing boy, who vanished from his foster grandmother's front yard on the NSW north coast.
“I felt like I was the worst mum in the world," an emotional Karlie says in the promo video.
“Whoever has him needs a bullet.”
William was last seen wearing a Spiderman costume in his grandmother’s yard in Kendall in September, 2014. He was just three years old.
Last year, the investigator heading the search for the missing NSW boy revealed it is likely police have already encountered the kidnapper.
Addressing media for the first time in 12 months, Detective Chief Inspector Gary Jubelin said it was “highly likely” police had come across the perpetrator.
"The strongest likelihood is that we've already got the name of the person involved," he said, 9 News reports. "I would be sweating.
In September 2016, a $1-million reward was offered for anyone who had information on the little boy’s disappearance.
See the full report on Channel Seven's Sunday Night on March 4.
This article originally appeared on Marie Claire.