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An elite FBI agent shoots his wife after he says she came after him with a knife -- was it self-defense or murder? "48 Hours" correspondent Susan Spencer investigates.
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Other episodes for this season
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![Hannah Graham: Deadly Connections [Part 1]](https://image.tmdb.org/t/p/w300/9MQY1O6qCbT6PlkQcDbe5tV2XpJ.jpg)
![Hannah Graham: Stalked by Evil [Part 2]](https://image.tmdb.org/t/p/w300/9MQY1O6qCbT6PlkQcDbe5tV2XpJ.jpg)
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

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

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An elite FBI agent shoots his wife after he says she came after him with a knife -- was it self-defense or murder? "48 Hours" correspondent Susan Spencer investigates.