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A 46-year-old man who attacked his wife in what a prosecutor called the worst domestic assault she has seen was sentenced Thursday to 50 years in prison.

Keith Allen McGill was sentenced by District Judge Mary Jane Knisely for eight felony charges related to the Sept. 12, 2011, attack on his wife at the couple's rural Yellowstone County residence.

Knisely ordered McGill to serve a total of 50 years for four felony counts of aggravated assault and four felony counts of assault with a weapon. The judge said the attack was a "horribly violent event," and the prison sentence "certainly seems just to me."

Knisely imposed the sentence after reading a letter from a doctor who said the woman's injuries were severe and will probably result in her death in a few years.

The woman has since divorced McGill and moved out of the county. She did not attend the sentencing hearing.

Deputy County Attorney Ann-Marie McKittrick said the case is "the worst domestic assault I've ever seen."

McGill declined to make a statement before he was sentenced. He pleaded no contest to the charges in August.