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Detective Sergeant Andrew Lonergan told the Downing Centre Local Court on Thursday: ''I've formed the view (the foster mother) knows where William Tyrrell is'.
The state's top secret crime-fighting agency has grilled William Tyrrell's foster mother accusing her of hiding the toddler's body after the boy fell from the verandah, a Sydney court has heard.
William Tyrrell's foster father potentially faces up to two years in prison if he is found guilty later this year on two charges of allegedly lying to the state's secretive top crime fighting body.
William Tyrrell's foster dad to face lengthy two day-hearing for allegedly lying in a secret NSW Crime Commission hearing after 'unsolved homicide' squad charged him in January.
William Tyrrell's foster father was charged by two detectives from the Unsolved Homicide team - including a senior strike force detective- with knowingly giving false and misleading evidence.