HAVRE, Mont. — Authorities are investigating the death of a man on Montana’s Fort Belknap Indian Reservation.

The Havre Daily News reports 48-year-old Antonio Castillo, Jr. was found dead of hypothermia on Dec. 29.

FBI supervisory agent Travis Burrows says the agency is investigating the case in coordination with the Fort Belknap Police Department and the Blaine County coroner.

Blaine County Undersheriff Frank Billmayer says in an email that Castillo died in an aged camper trailer with insufficient heat for the sub-zero air temperatures present at the time of his death.

Billmayer says there’s no indication of any cause of death other than hypothermia and exposure.

Information from: Havre Daily News, http://www.havredailynews.com

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