The Lake County coroner and Vernon Hills police are investigating the "suspicious" death of a 15-year-old girl over the weekend.
The girl, whose name was not released Sunday by authorities, was pronounced dead at 11:39 a.m. Saturday at Advocate Condell Hospital in Libertyville, Coroner Artis Yancy said.
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An autopsy scheduled for Monday could help determine the girl's cause of death, he added.
Vernon Hills police confirmed Sunday that a death investigation is under way, but declined further comment.
According to numerous sources the girl was a student at Vernon Hills High School.