James Ortiz is hospitalized. His girlfriend, Malerie Nick of Fairport Harbor, was killed in the blast just before 7 p.m. Wednesday

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ORWELL TOWNSHIP, Ohio -- The state fire marshal's office has ruled a home explosion that killed a woman and critically injured her boyfriend accidental.

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James Ortiz is hospitalized. His girlfriend, Malerie Nick of Fairport Harbor, was killed in the blast just before 7 p.m. Wednesday.

The state fire marshal's office says a toilet in the home was continuously running, which emptied the water well.

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The well then filled with natural gas, which spread through the home's plumbing.

Someone then lit a cigarette, causing the explosion.

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The Ohio Department of Natural Resources has opened its own investigation.

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