Mundelein teen pleads guilty to first-degree murder

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MUNDELEIN, Ill. — A teenager pleads guilty to murdering her younger sister in a plea deal that could let her go free when she turns 21.

The murder happened just over a year ago in a home in suburban Mundelein, when the teenager was fourteen.

WGN is not releasing the name of the suspect because she was a minor when the crime happened.

She admitted stabbing her 11-year-old half-sister dozens of times after an argument.

The teen will be formally sentenced in March.

The plea deal calls for her to remain in a juvenile facility until her 21st birthday.

She is also required to receive mental health treatment.

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