The fire broke out Thursday at an apartment complex off Lynn Road on Riveroak Turn.
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Authorities said 16-year-old Dale Murphy was home when the flames broke out.
An eyewitness said the victim was pulled from a bathroom in a first-floor unit and taken to the UNC Burn Center, where she later died.
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After more than a week of investigating, fire crews determined that the fire was intentional; however, they have not said how the fire was started.