A man and his baby son were missing for two days before they were found dead in a car parked on an isolated track on the Sunshine Coast.
Council workers found the bodies of a 46-year-old Redcliffe man and his six-month-old son inside a red Holden Commodore parked near the Roys Road camping ground on the banks of Coochin Creek about 8am on Wednesday.
The case is being investigated by police as a murder-suicide.
"A six-month-old child deceased with the father, they'd obviously been there for some time," Detective Inspector Dave Drinnen said.
"The father and child failed to turn up in relation to some custody arrangements and as a result of that the mother was concerned."
The pair was reported missing on Monday after failing to meet the little boy's mother.
It sparked a high-risk missing persons investigation but police did not issue an amber alert seeking the public's help.
The investigation will consider why an amber alert was not issued.
Detective Inspector Drinnen said the case involved domestic violence allegations, but did not go into detail.
No weapons were found in the car.
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