Who knows, but whoever the 'source' is, seems to know an awful lot about the case details.
Earlier this year, William's foster father, who cannot be named, also pleaded not guilty to two charges of giving false or misleading evidence to the crime commission.
The 55-year-old will front court for a two-day hearing in October where audio recordings of his police interviews will be played.
The 56-year-old is accused of giving false evidence during a hearing into the disappearance of William Tyrrell from his foster grandmother's home in 2014.
www.abc.net.au
bbm.