NSW Police is appealing for public assistance as they reveal nine-year-old Charlise Mutten was killed by a gunshot wound. 

The girl’s stepfather was charged with her murder and her body was found in a barrel near Sydney’s Colo River.

The child was reported missing from the Blue Mountains on Friday, January 14.

Police have released CCTV of a red ute towing a boat at three locations on the evening of January 13.