Police have revealed how eight-year-old Charlise Mutten died, after her body was found in a barrel last week.
Investigators told the media on Tuesday that the girl suffered a fatal gunshot wound.
Police have also released CCTV images of a vehicle they want to know more about.
The images show a ute pulling a boat trailer into a petrol station at 851 Richmond Road in Marsden Park in Sydney’s northwest.
The video was captured at 5.53pm on January 13.
Charlise was reported missing from Mt Wilson at 8.20am on January 14, but had not been seen since the previous afternoon.
Her disappearance sparked a massive five-day search of dense bushland, with more than 100 emergency personnel joining the operation.
Police searched near the Colo River on January 18, about an hour’s drive from where the girl went missing and found a child’s body in a barrel.
Her 31-year-old stepdad Justin Stein was arrested in Surry Hills the same day.
Stein has been charged with murder and refused bail.
He is currently before the courts.