A Silver Advisory issued for a 72-year-old Defiance woman with dementia and diabetes was canceled Thursday after she was found safe, according to an updated release. Pamalee Ross Willenbrink had been reported missing after she was last seen around 2 p.m. Wednesday, driving a silver Chevrolet Traverse in the 700 block of Matson Hill Road in Defiance, Missouri.
The advisory, sent through the Missouri State Highway Patrol on behalf of the St. Charles County Police Department, described Willenbrink as standing 5 feet, 4 inches tall and weighing about 200 pounds, according to ABC 17 News. The exact street-level detail of her last known location and vehicle came from a report by KRCG-TV, which placed the sighting on Matson Hill Road, a rural stretch near Katy Trail access points in southwestern St. Charles County.
Under Missouri State Highway Patrol criteria, an Endangered Silver Advisory can only be issued when a missing adult is 60 or older and believed to suffer from dementia or another cognitive impairment, and a legal custodian must file an official missing person report before the alert goes out. To launch the alert, local agencies like the St. Charles County Police Department enter an Endangered Missing code into the Missouri Uniform Law Enforcement System and coordinate with Highway Patrol Troop F Headquarters in Jefferson City, which serves as the state's clearinghouse for advisory forms.
A Rural Landscape That Complicates Searches
Defiance is an unincorporated community defined by rolling bluffs, 3-to-5-acre residential parcels, and dense recreational areas surrounding Klondike Park and Katy Trail State Park, according to Gateway Realty Group. The wooded terrain and proximity to the Missouri River bluffs can heighten urgency when a vulnerable resident wanders, a challenge underscored in reporting on the area by Living St. Louis.
Willenbrink was widowed in August 2025 after the death of her husband, James Willenbrink, an 82-year-old U.S. Army veteran and 60-year volunteer firefighter in Augusta, Missouri, according to an obituary from Pitman Funeral Home. The couple lived in Defiance and raised two daughters in the area, a detail that adds context to her long-standing ties to the community.
Part of a Broader Pattern Across the Region
This is not the first Silver Advisory issued in the St. Louis metro area this year. The St. Louis Metropolitan Police Department issued a similar alert on August 5 for a 73-year-old man with dementia who disappeared after leaving his residence in Northampton, a case Hoodline previously reported.
The pattern reflects a statewide issue. An estimated 122,300 Missourians aged 65 and older are living with Alzheimer's disease, supported by 227,000 unpaid family caregivers who contribute more than 350 million hours of care annually, according to the Alzheimer's Association's 2026 facts and figures report. The same organization notes that 60 percent of people living with dementia or Alzheimer's will wander away from home at least once during the course of their illness, and that wandering can occur at any stage of cognitive decline.
Why Early Detection Matters
Research from the Fisher Center for Alzheimer's Research Foundation shows that individuals with Alzheimer's average six to eight unannounced departures before caregivers recognize wandering patterns, contributing to an estimated 125,000 search-and-rescue operations nationwide each year. The Missouri Department of Health and Senior Services' Alzheimer's State Plan Task Force has separately identified limited public awareness and diagnostic challenges in rural communities as major obstacles to dementia care across the state, pointing to gaps in local respite and assistance resources.
For now, the outcome in Defiance is the one families hope for. Willenbrink returned home safely, according to the updated release, closing out a search that unfolded across some of St. Charles County's most rugged terrain.
