Montana woman sentenced to 45 years in Summerset stabbing death

SUMMERSET, S.D. – The latest court developments for a woman arrested for the death of Phyllis Mastin in Summerset. CRIME DETAILS

Oct. 23, 2018

Stormy Marsh was sentenced Tuesday in the stabbing death of her roommate Phyllis Mastin.

For the conviction of first-degree manslaughter, Marsh was sentenced to 60 years with 15 years suspended. She received credit for 457 days served since her arrest.


Montana woman pleads not guilty to Summerset murder

Aug. 21, 2017

(AP) – A Montana woman accused of killing her roommate in the South Dakota town of Summerset has pleaded not guilty.

Thirty-eight-year-old Stormy Marsh, of Miles City, Mont., is charged with second-degree murder in the death of 49-year-old Phyllis Mastin, who was found dead in her mobile home Aug. 2. Marsh entered her plea Monday.

Authorities say Mastin was stabbed several times and that a knife and gun were found under her body. Police say they found Marsh at a Rapid City motel with the victim’s car and cellphone.

Marsh maintains Mastin was alive when Marsh left the home after witnessing a fight between Mastin and her ex-boyfriend.

Second-degree murder is punishable by up to life in prison.

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