Murder charges will be filed against the uncle of 7-year-old Willow Long.
Prosecutors say Justin DeRyke is guilty of first-degree murder.
The arrest comes less than a day after the body of a young child was found near Willow's home in Watson, Illinois. A forensic pathologist positively identified the remain as Willow on Tuesday. The investigation also revealed that she had been murdered.
Effingham County authorities started search efforts after the girl's mother reported her missing on Sunday morning.