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A 14-year-old girl repeatedly stabbed her 11-year-old half-sister to death with a kitchen knife for being “ungrateful” to her, prosecutors said in a suburban Chicago courtroom Wednesday.

First-degree murder charges were approved for the unnamed 14-year-old girl after her half-sister was found dead in their Mundelein, Ill. home early Tuesday, prompting a lockdown at three local schools.

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