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Paul Kevin Curtis, who had been in custody under suspicion of sending ricin-laced letters to President Barack Obama and others, wipes a tear from his eyes during a news conference following his release Tuesday.

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Men's yearslong fued looms over ricin probe

The investigation into poisoned letters mailed to President Barack Obama and others has shifted from an Elvis impersonator to his longtime foe, and authorities must now figure out if an online feud between the two men might have escalated into something more sinister.

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