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Published January 28, 2013, 08:50 PM

Bismarck man is sentenced to life for murdering his mother

(WDAY TV) -- Nearly a year after 83-year-old Ann Grenstiner is found beaten to death in her Bismarck home, her son has been sentenced to life in prison for the murder.

By: WDAY Staff Reports, WDAY

(WDAY TV) -- Nearly a year after 83-year-old Ann Grenstiner is found beaten to death in her Bismarck home, her son has been sentenced to life in prison for the murder.

Dean Grenstiner will have to serve 30-years in prison, before he is considered for parole.

A letter, written by his brothers, was read at Grenstiner's sentencing hearing. They hoped for the maximum sentence, and hope he spends the rest of his life thinking about what's he's done. They said, "Good bye Dean, may God forgive you."

Grenstiner will be about 70 before he's considered for parole.

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