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But as I suspected, it's not what killed her.
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I found a needle mark on the side of her neck.
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She was injected with a syringe.
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She was poisoned?
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Not exactly.
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The killer inserted the needle of an empty syringe
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into Dr. Monroe's carotid artery,
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then pushed the plunger,
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forcing air directly into the brain, causing a fatal--
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- Air embolism. - Gold star for Castle.
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And judging by the skill of the injection,
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I'd say it was done by a medical professional.