Detective Acting Inspector Mick Searle said investigators would allege Beau suffered a traumatic brain injury and other internal injuries.
A crucial part of the “detailed, thorough and at times difficult investigation” was confirming Beau was healthy at Illawong Beach between 9.30am to 11am on June 2, and determining what happened between then and an ambulance being called later that afternoon, Acting Inspector Searle said.
Detectives consulted with doctors from Mackay and Townsville hospitals as well as specialists from the Queensland Children’s Hospital during their evidence-gathering process.
Acting Inspector Searle said last month there was no history between Beau’s family and the Department of Child Safety prior to the baby’s death.
Beau’s remaining family were “understandably very upset” after being told of the arrest and they continued to deal with “a very traumatic experience”, Acting Inspector Searle said.