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she had found in her mailbox a few days before.
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Was it investigated?
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They started a file, but Helen wasn't especially concerned.
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And in light of Campbell's death,
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they exhumed Helen Mitchell's body,
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and lethal amounts of arsenic were found in her system as well.
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Handwritten letters, poisoning by arsenic--
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we could be looking at a female unsub.
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Who wants her victims to have foreknowledge of their deaths.
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That's a new one.
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Actually, we've seen a version of this M.O. before.
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6 years ago in Dallas, Max Pool warned his victims