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Donald Day Jr, 58, had allegedly been coaching paranoid Gareth and Stacey Train over the internet for months before they and Gareth's brother Nathaniel ambushed four police officers.
Five schools participated in the competition's first year.
Nine Entertainment has been blasted by one its highest paid stars for broadcasting a third 'offensive' interview with the daughter of the doomsday prepper cop killers.
Nathaniel, Gareth and Stacey killed officers Rachel McCrow, 29, and Matthew Arnold, 26, in a horrific siege in December when the officers attended their country Queensland home.
Madelyn Train, 26, has revealed how how her family of doomsday prepper cop killers had been cut off from their family after they made child abuse claims.