(SIDNEY, Mont.) — Missing Montana mother and teacher Sherry Arnold is dead, according to a post on her school district’s website. The FBI announced Friday that they have one person in custody and another being questioned.
Arnold, 43, disappeared around 6:30 a.m. on Dec. 7 when she went out for an early morning run near her home in Sidney, Mont. A single running shoe was the only trace of Arnold left behind.
“Based on a tip from the public, law enforcement took one adult male into custody, and another adult male is being questioned by police,” FBI spokeswoman Debbie Dujanovic Bertram said in a statement. “The investigation to determine what happened to Ms. Arnold continues.”
Sidney Public School officials posted a message on the school district’s website saying that they were informed of her death Friday morning, after Arnold’s family was notified. Arnold was a married mother of two, and stepmother of three.
Arnold was a teacher in Sidney since 1993, teaching at both the middle school and high school, where she was a math teacher at the time of her death.
Search and rescue teams used canine units, private planes, a helicopter, and searchers on ATVs and horseback. Hundreds of community members turned out to help the Sidney Police Department and the FBI search for Arnold.
Sidney is a small town of roughly 5,000 people that has experienced a sudden influx of out-of-towner oil workers following the Bakken oil boom in North Dakota, according to the Billings Gazette.
Sidney Police Chief Frank DiFonzo told the newspaper that crime rates have gone up since the influx in areas including bar fights, domestic violence and drunk driving.
Copyright 2012 ABC News Radio
Jennifer Rizzo, CNN
Dan Berman, CNN
Megan McNulty, Deseret News
Elizabeth Cohen, CNN