Stepmother charged with murder after four-year-old girl's death

Police have arrested the stepmother of Brisbane girl Willow Dunn and charged her with murder. 

The four-year-old's severely malnourished body was found at a Cannon Hill house last week.

Her father, Mark James Dunn, 43, has been charged with her murder and on Wednesday, police confirmed they had also arrested and charged Willow's stepmother with her murder.

Shannon White, 43, will appear in the Brisbane Magistrates Court later on Wednesday. 

Shannon White (centre) is taken from the Morningside police station after she was arrested in Brisbane on Wednesday. Source: AAP

Detectives will continue to investigate the health, care and treatment of Willow, who had Down syndrome, in the days, weeks, months and years before she died. 

"We have initiated investigations and inquiries in New South Wales, and in particular, we have advanced investigations that will continue and progress in South Australia," Detective Inspector Chris Knight said. 

South Australia's major crime squad is involved. 

The little girl's family moved from South Australia to Brisbane in 2017. 

Police seen at a property in Cannon Hill when Willow Dunn's body was discovered last week. Source: AAP

Police were faced with an "extremely confronting" scene at the home where Willow's body was found, with a post mortem finding she had suffered sustained mistreatment and had a litany of injuries. 

Her death is being investigated by Cheryl Vardon, who leads the Queensland Family and Child Commission, to determine whether Queensland's child safety system failed. 

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