The identification was made Thursday after the body of 43-year-old Sherry Arnold was taken to the Montana State Crime Lab in Missoula.

Authorities say they started recovery efforts Tuesday and found the body buried on Wednesday. It's still not clear what led them to that location.

Two Colorado men, Lester Vann Waters Jr. and Michael Keith Spell, both from Parachute, Colo., have been arrested and charged with aggravated kidnapping in the case and face a possible death penalty if convicted.

Spell received court permission to leave Colorado just two days before the woman disappeared.

The Grand Junction Daily Sentinel reported that Spell got approval from a Garfield County judge on Jan. 5 to go to Texas, saying his brother had been in a car accident there.

Arnold disappeared two days later in Sidney, Mont., while out on her morning run.

The FBI says no other details will be released in the case at this time.