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There's clear evidence of overkill on both.
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Craig's face was caved in,
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and the damage to Heather's genitals was extensive.
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He's angry, but about what?
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Well, the motive on Heather appears sexual.
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She was stripped down to nothing more than a watch,
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while Craig was left fully clothed.
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His wallet was missing.
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There might be some kind of financial motivation.
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Or it's plain old-fashioned jealousy.
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He kills Craig in a rage and the beast is unleashed.
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That's when he starts targeting women.