Mundelein teen pleads guilty to first-degree murder
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.