Major Collision Investigation Unit detectives are investigating a fatal collision in Lucas on 10 August.
It's believed a silver Mazda sedan collided with a white Toyota Prado on Carngham Road near Finchs Road just after 7pm.
A passenger from the Mazda, a 6-year-old Winter Valley child, died at the scene.
A second passenger from the Mazda, a 13-year-old Winter Valley child, was airlifted to hospital with non-life-threatening injuries.
The driver of the Mazda, a 41-year-old Winter Valley woman, was taken to hospital with non-life-threatening injuries.
The driver and sole occupant of the Toyota, a 78-year-old Haddon man, was taken to hospital with non-life-threatening injuries.
The exact circumstances surrounding the collision are yet to be determined and investigations remain ongoing.
Anyone who witnessed the incident, with dashcam footage or any other information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au
