FBI agents investigating hypothermia death on Fort Belknap

The FBI, in conjunction with the Fort Belknap Police Department, is investigating the death of 48-year-old Antonio Castillo Jr., who was found dead of hypothermia Dec. 29 on the reservation.

“We are investigating Mr. Castillo’s death along with the Fort Belknap Police Department and an assist by the Blaine County Coroner,” Travis Burrows, supervisory senior resident agent with FBI Billings, said in an email Wednesday.

Blaine County Undersheriff Frank Billmayer said in an email Thursday that Castillo died of hypothermia and exposure in an “aged bumper pull type camper trailer wit...