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Sheriff: Man Accused of Killing Lincoln County Deputy and Eureka Woman Dies in Custody

Missoula County authorities opened a standard in-custody death investigation after Matthew David Dye became unresponsive and was pronounced dead at a hospital.

  • On Wednesday, Matthew David Dye, the 50-year-old man accused of killing Lincoln County Deputy Ryan Terpsma and Merissa Walker, died while in custody at the Missoula County Detention Facility.
  • Dye was arrested on October 30 after the Eureka shooting, during which he led law enforcement on a high-speed pursuit exceeding 90 mph with a 7-year-old child in his vehicle.
  • Detention staff observed Dye appearing to experience a "medical emergency" Wednesday evening; he was transported to Providence St. Patrick Hospital, where he was pronounced dead after unsuccessful lifesaving measures.
  • The Missoula Police Department is investigating the death as "standard operating procedures" for in-custody fatalities, with Sheriff Jeremiah Petersen stating the office remains committed to safety standards.
  • Dye's death effectively ends the criminal proceedings in Lincoln County Justice Court, where he faced two counts of deliberate homicide, leaving the motive for the October 30 shooting officially unresolved.
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Suspect in slayings of sheriff's deputy, woman dies after Missoula jail 'medical emergency'

Matthew D. Dye, 50, had been charged with two counts of deliberate homicide in connection with the deaths of Deputy Ryan Terpsma and Merrissa Walker.

·Missoula, United States
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NBC Montana broke the news in Missoula, United States on Thursday, November 5, 2026.
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