The Ellsworth Police Department has identified the victim of a Sunday morning Ellsworth house as Daniel J. O'Brien, 39, Ellsworth.

Greg Place, Ellsworth police chief, says it appears O'Brien was trapped in the duplex residence at 244 S. Piety St. in Ellsworth and that his body was recovered inside the structure by firefighters from the Ellsworth Fire Department.

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The man was pronounced dead on the scene by Susan Dzubay, Pierce County Medical Examiner. Dzubay says that an exact cause of death has not yet been determined and that an autopsy has been performed by the Ramsey County Coroner's Office in St. Paul.

"We are waiting on toxicology results before we can make an official determination," said Dzubay.

The fire took place at around 4:15 a.m. and engulfed the entire structure, according to Brent Langer, Ellsworth Fire Department chief.

"Smoke and flames were coming from the structure when we arrived," said Langer.

He added that 27 firefighters battled the blaze and that the Ellsworth Fire Department was on the scene for 13 hours.

"The structure had a steel roof and was made of brick so it trapped heat really well," Langer said.

Two firefighters who were on the initial entry team into the structure received minor burns and were treated on the scene, according to Langer.

The Wisconsin State Fire Marshall is assisting in the investigation of the fire.