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Story summary
- Montgomery County Police identified Karen Elsa Carstens, 55, as the Chevy Chase, Maryland, house-fire victim on April 3.
- Carstens died after re-entering her burning home to rescue her cat.
- Firefighters found heavy flames on arrival.
- The home lacked working smoke detectors, allowing rapid spread.
- Investigators initially focused on lithium batteries stored in the garage, which complicated firefighting but did not cause the fire.
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