(NEWSER) – The morning after 16-year-old Gynnya McMillen was brought to the Lincoln Village Juvenile Detention Center in Louisville, Ky., she was found alone in her cell, dead. It's been almost two weeks, but neither local nor state officials are going public with any information regarding how she died, reports CBS News.

Not only is it unclear why she had no roommate in the cell or how often she was checked on, the teenager was apparently healthy, with the Hardin County coroner saying there were no physical signs of foul play and expressing doubts that she had a heart condition. "It's a complete mystery right now," says Dr. William Lee, who notes it could take weeks to get toxicology results. The last person to die in custody at a Department of Juvenile Justice facility was in 1999, the year of Gynnya's birth.

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