Four people are behind bars in the February death of an Oldham County teen.
Investigators say 16-year-old Summer Williams was killed when she took a combination of dangerous drugs.
Police have arrested four adults they say were involved in selling summer the drugs.
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27-year-old Phillip Kinser is charged with unlawful transaction with a minor and trafficking a controlled substance.
Tiffany Mull, Tiffany Richardson and Roger Wilson are charged with unlawful transaction with a minor.