The mother of two young brothers who drowned in Townsville's Ross River in February is expected to be charged with their manslaughter.
Barak Austral, 5, and Jhulio Sariago, 3, drowned after they wandered away from their home sometime between 5.30pm and 6.30pm on February 25.
Their mother Leanne Eatts has been arrested and is expected to be charged with manslaughter on Friday afternoon, police say.
Detective Dave Miles says Ms Eatts has yet to be interviewed over the tragedy but was "solely responsible" for the preventable deaths of her sons.
"There is no way these boys should have been left the way they were, or ... allowed to go down to the river and certainly their deaths under appropriate parental supervision would have been averted," he said.
Det Miles said the tragic events on the day the boys wandered off alone and drowned were not isolated but a "systemic behaviour" of their mother and the lack of supervision.
"This is a catastrophic result for this family and it was a preventable tragedy," he said.
Police are also investigating if drugs or alcohol were factors in the boys' deaths.
"What we do know is that for a considerable amount of time there was complete inattention as to where these young boys were or where they may have gone."
The bodies of Barak and Jhulio were found submerged in a steep and deep cutaway of the Ross River in Cranbrook on the morning of February 26.
They were within two metres of each other.
Ms Eatts is also expected to face drug-related charges including supplying dangerous drugs to a minor.
© AAP 2019
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