(UPDATE, 10:07 p.m.) The search for Catherine Rearden continues in Cascade County.
Montana Fish, Wildlife, and Parks assisted with a thermal drone search, and two helicopters from Malmstrom Air Force Base joined the search at around 6:30 p.m., assisting with aerial searches of the surrounding terrain, river areas, coulees, and nearby properties.
Sheriff Slaughter provides information - watch the video:
Cascade County Sheriff Jesse Slaughter said that two years ago, Catherine walked away from the same residence and was later found about three miles away near 747 Millegan Road, where she had been hiding from people attempting to locate her.
Investigators say Catherine may display mild or childlike behavior, become ornery, make irrational statements about family members, or talk to people who are not present.
She frequently talks about growing up in Fort Shaw and may attempt to travel in that direction. Residents in the Fort Shaw area are encouraged to remain alert and report any possible sightings.
Searchers are asking the public to carefully check properties, outbuildings, brush, vehicles, and any areas where a person could become stuck or concealed.
Residents in the area should expect to see deputies and Search and Rescue personnel continuing operations throughout the night.
At this point, volunteers are not needed to assist with search efforts.
(1st REPORT, 5:12 p.m.) The Montana Department of Justice has issued a Missing/Endangered Person Advisory for Catherine Rearden in Cascade County.
The MEPA was requested by the Cascade County Sheriff's Office and was issued just before 5 p.m. on Wednesday, May 6, 2026.
Catherine is missing from 1021 Milligan Road; she is 77 years old, stand 5'10", weighs about 165 pounds, has blue eyes and grey hair.
She was last seen on foot and was wearing a black winter hat with flaps, black coat, and jeans.
The advisory says that she has "severe dementia" and may attempt to hide in outbuildings on neighboring properties.
Authorities believe she may be in danger due to health concerns.
If you are a neighbor in this area, you're asked to search through your property and outbuildings.
The Cascade County Sheriff's Office says that deputies are searching the area.
If you see her, authorities ask that you do not approach, and please call 911 immediately.
