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THOMPSON FALLS – A Missoula man was given consecutive life sentences Tuesday for a brutal home invasion in Dixon 11 months ago that left a man dead and his wife seriously injured.

District Court Judge Kim Christopher handed down the sentences for Nathan Lee William Calvert at the Sanders County Courthouse after hearing from eight witnesses, including the victim who survived and three mental health professionals.

Calvert, 32 at the time of his arrest, had pleaded guilty but mentally ill in the case.

He murdered 61-year-old Doug Morigeau on Dec. 6, 2012, and also tried to kill Morigeau’s wife, Cheryl.

Calvert, who said he was high on synthetic marijuana, also known as spice, at the time, had previously told Christopher he was suffering a mental breakdown that caused him to feel like he was falling into a black hole.

He became paranoid that other people were trying to kill him, Calvert said.

He was visiting relatives in the area and went in search of cigarettes with a brother-in-law on the day Doug Morigeau was killed.

He first stabbed his brother-in-law because of the paranoia, then went to the Morigeau residence seeking help, he said.

Calvert did not know the Morigeaus.

After Doug Morigeau answered the door, Calvert began stabbing him – 54 times, according to court documents.

He also beat Morigeau with a rifle, and slashed the throat of Cheryl, who escaped and sought help at a relative’s house.

The consecutive life sentences were given for two of the four felonies Calvert was charged with: deliberate homicide and attempted deliberate homicide.

Christopher also sentenced Calvert to 40 years apiece for aggravated burglary and robbery – sentences that will run concurrently.

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Reporter Vince Devlin can be reached at 1-800-366-7186 or by email at

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