St. Louis/ Crime & Emergencies

Franklin County Searches for 75-Year-Old Woman Missing Since Saturday in Side-by-Side

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Published on November 07, 2026
Franklin County Searches for 75-Year-Old Woman Missing Since Saturday in Side-by-SideSource: Missouri State Highway Patrol

Authorities are asking the public to help locate Patricia Louise Pfeiffer, a 75-year-old Franklin County woman with dementia who has been missing since Saturday morning. She was last seen driving away from her home in a red Polaris side-by-side vehicle.

The Franklin County Sheriff’s Office issued an Endangered SILVER Advisory for Pfeiffer, according to FOX 2. She was reported missing Saturday and was last seen around 8 a.m. near Grand Army Road and Fiddle Creek Road in unincorporated Franklin County.

How Pfeiffer Disappeared

According to the advisory details reported by FOX 2, Pfeiffer left her home through an unlocked door and drove away in the side-by-side. She has not returned home, and authorities say she has been diagnosed with dementia, raising concern for her safety.

Pfeiffer is described as 5 feet 5 inches tall and 189 pounds, with gray hair and blue eyes. She was last seen wearing pajamas and a dark blue coat, according to the same account.

How Missouri’s Endangered Silver Advisories Work

The Missouri State Highway Patrol’s Endangered Silver Advisory program is designed to quickly share a missing adult’s description so people in the affected area can watch for the person and alert local law enforcement, according to the Missouri State Highway Patrol. The patrol’s criteria include that the missing person be at least 60 and believed to have dementia or another cognitive impairment; that a legal custodian file a missing-person report with local law enforcement; and that enough information be available to help the public locate the person, according to the agency’s criteria.

What To Do If You See Her

Anyone with information about Pfeiffer’s whereabouts is asked to call 911, their nearest law enforcement agency, or the Franklin County Sheriff’s Office at 636-583-2567, option 3.