HOUSTON An investigation is under way after the medical examiner said a 17-year-old girl died of hyperthermia last week.

Shanice Nibbs first showed symptoms of heat exhaustion during a nature walk at the Five Oaks Achievement Center, where she lived.

The state-run facility is in New Ulm west of Houston.

Nibbs died at Texas Children's Hospital.

Her death marks the fourth heat-related death in the Houston area.

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