Police opened an investigation into the death of a seven-year-old boy in Craigmore in February.
Investigators are investigating the death which they believe may have been caused by criminal negligence.
The seven-year-old died shortly after his father took him to Lyell McEwin Hospital in February.
Police later removed five other children from the man’s home in Craigmore, aged between seven and 16.
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Detective Superintendent Des Bray told ABC News that investigators reviewed a significant amount of evidence surrounding the child’s death, including a post-mortem report.
“There is an enormous amount of records and we’ve only had a cursory look at them since we got them, but it looks like enough to start a criminal investigation,” Detective Superintendent Des Bray said.
“Several serious health issues have been identified but in and of themselves [were] not necessarily cause for immediate concern.”
The boy’s death has been delegated to Taskforce Prime which is also investigating the death of six-year-old Charlie.
Police are urging anyone with information about the child’s death to contact Crime Stoppers on 1800 333 000.
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