Jessica McDonald was last seen with a friend at her sister's house in the Bayou Vista area of Galveston County on Tuesday.
She and the friend left the house Tuesday night, Galveston County Sheriff Henry Trochesset said. The friend was found the next day inside her own car on Lakeside Drive, which is down the street from the sister's house. The friend was disoriented and was taken to the hospital.
The body, which authorities say had no obvious signs of trauma, was found not far from where McDonald's friend was located.
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