Sandra Woods of Conrad, who was found dead in her workplace last week, died of a stroke.
The State Medical Examiner, who conducted the autopsy at the state crime lab in Missoula, determined that Woods died from an intracerebral hemorrhage, commonly known as a stroke.
Authorities had been investigating Woods' death because she had been assaulted by her long-time boyfriend Kenneth Wayne Gregg about 40 hours before she died.
The Division of Criminal Investigation, part of the Montana Department of Justice, had been called in to assist in the investigation.
Woods, 49 years old, was found dead at her workplace, the Pondera Medical Center, on October 5th.
During the investigation into her death, authorities noted swelling and bruising on her face. Woods had told fellow employees that she had been injured in an ATV crash.
When Gregg arrived at the hospital, he admitted to hospital staff that Woods had not been in an ATV crash, and said that he had assaulted her.
When he was interviewed by investigators, Gregg said that he had gone out drinking on the night of October 3rd and returned home at about 2:30 a.m. on October 4th.
Gregg said that Woods had been drinking and started yelling at him, and she would not shut up, and he "punched her on the left side of her face as many as 4 times," according to court documents.
Later that morning, he saw that she had sustained a bruise on her face, and he advised her to tell people that she was in an ATV accident. Gregg told investigators that he did not want people to know that he had the wounds she had on her face.
Gregg was then arrested on a charge of partner/family member assault (PFMA).
The medical examiner determined that the assault, which happened approximately 40 hours earlier, was not a contributing factor in her death.
Pondera County Attorney Mary Ann Ries said, "The physical assault that occurred earlier last week was not a contributing factor to that death. It's been a determination that she died of natural causes."