Leider Pleads Guilty - KULR-8 Television, Billings, MT

Leider Pleads Guilty

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A St. Xavier woman pleads guilty to second-degree murder of her three-year-old daughter in federal court Wednesday.

According to documents, 25-year-old Mary Agnes Leider faces life in prison for the death of Tenielle Big Day. Big Day was found dead next to Highway 313 on December 3rd last year. Prosecutors say Big Day was on Leider's lap when she opened the passenger door and threw Tenielle onto the highway. Leider was out with big day and her two brothers partying the night before.

Sentencing for Leider is set for October 22nd.