CORONA (CBS)  — A 48-year-old Nevada woman suffering from some type of medical emergency fell to her death from a freeway overpass on southbound Interstate 15, according to the county coroner.

Maria Estrada of Henderson, Nev., fell about 60 feet into a drainage channel from an overpass about 30 feet south of Temescal Canyon Road near Corona shortly after midnight, the coroner said.

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Estrada was airlifted to Riverside Community Hospital, where she was pronounced dead at 6:57 a.m., according to the coroner.

A CalFire spokeswoman said that she had some sort of medical emergency, but other details concerning the cause of her death were not immediately clear.

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The California Highway Patrol temporarily closed lanes on the southbound 15 for an investigation, but the freeway was reported reopened at 1:28 a.m.

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