Hayden Panettiere had transformed into a real-life convicted killer.

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The "Scream 4" star covered her cute, pixie cut up with a wig while shooting Lifetime movie "The Amanda Knox Story" yesterday in Rome -- in which she plays the title role.

Knox was found guilty of murdering her roommate in 2007 while studying abroad in Perugia, Italy and is currently serving a 26 year sentence.

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