Police Confirm Sunshine Coast Murder-Suicide Involves Six-Month-Old Baby Boy

A father and his six-month-old baby boy are dead in a suspected murder-suicide on the Sunshine Coast.

Police have responded to the "distressing" incident at Coochin Creek, on the Coast's hinterland, with a 46-year-old man and a six-month-old boy found dead in a car near a campground.

The boy had been reported missing several days ago after his father failed to arrive for "custody arrangements", police said. It is believed the boy's father and mother had been in a relationship but had separated.

Police confirmed there were circumstances involving "domestic violence that has been reported or alleged" surrounding the family. The boy's mother is said to be "distraught".

The bodies were found in a red Commodore on Roys Road by council workers at 8am on Wednesday. Police said the crime scene was "tragic", and that the bodies had been there "for some time".

"The father and the child failed to turn up in relation to some custody arrangements, and as a result of that, the mother was concerned in relation so some welfare checks initially before this was reported as a missing person investigation," QLD Police Detective Inspector David Drennin said.

Police are treating the child's death as suspicious and the man's death as not suspicious.

No weapons were found in the car.

The man is believed to be from Redcliff in the Morton Bay region of Queensland.

Forensic investigations and a post-mortem will be carried out to confirm circumstances leading up to the deaths.

If you need help in a crisis, call Lifeline on 13 11 14.

If you or someone you know is in immediate danger, dial 000. If you need help and advice, call 1800Respect on 1800 737 732, or Lifeline on 13 11 14. A range of domestic and family violence resources based around the country can be found here.