A fugitive yoga teacher who allegedly gunned down her love rival in likely traveled to Costa Rica using her sister's passport and possibly underwent plastic surgery while on the run.Kaitlin Armstrong, 34, was arrested at $50-a-night 'treehouse hostel' in Santa Teresa Beach on Wednesday after having been sought after by U.S. authorities since May 11. A witness to her arrest alleged the fugitive left behind two American passports in a locker where she had stored her things. One of the documents bore her name and the other seemingly belonged to her lookalike sister, Christine Armstrong.
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