On Friday, officials in Warren County identified the girl as Wendy Louise Baker.
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Baker, 16, went missing back from Coatesville in 1991.
She was later found dead in Knowlton Township.
At the time, the teen was nicknamed "The Tiger Lady" because of a large tiger tattoo on her calf.
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But after using DNA and genealogical databases, authorities were able to confirm her identity.
A cause of death has still not been determined.