MINNEAPOLIS (WCCO) – Authorities have identified a 64-year-old man who died in a house fire in Sleepy Eye on Sunday.

Crews were called just after 8 p.m. to a report of a residential fire at 26260 260th Street. The fire was at a two-story house north of Sleepy Eye in rural Brown County. When crews arrived, the residence was fully engulfed and the house collapsed as a result of the fire.

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A witness was taken to a hospital to be treated for smoke exposure and released. Authorities recovered human remains from what was left after the fire.

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They were identified Monday as the homeowner, 64-year-old Glen Leo Mangen. The Ramsey County Medical Examiner ruled the cause of death as carbon monoxide poisoning due to smoke inhalation. His manner of death was accidental.

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The cause of the fire is under investigation. The Brown County Sheriff’s Office, Sleepy Eye Fire Department and Sleepy Eye Ambulance all responded to the scene.