YORKVILLE, Ill. - A months-long investigation into the death of a Yorkville teenager who went missing in June has concluded with no signs of foul play, but the cause remains undetermined, according to the Kendall County Coroner’s Office.

What we know:

The coroner confirmed the body found June 22 in the Country Hills subdivision was 16-year-old Aiyana Williams. Advanced decomposition made the investigation difficult, requiring outside experts and labs across the country to conduct DNA, toxicology and insect analysis.

Independent reports determined Williams likely died between June 17 and June 18, consistent with the timeline provided by her family and police. Toxicology results showed only caffeine in her system. Forensic examination revealed no evidence of trauma.

On Sept. 10, DNA te

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