Toepfer was last seen in Riverside, California, on April 8, 2015. That morning, she boarded a Riverside Transit Agency (RTA) bus at Vernon Avenue and Mission Boulevard in Jurupa Valley. She later disembarked at the downtown Riverside terminal on University Avenue and was last observed walking east toward Market Street. She has not been seen or heard from since. Toepfer relied on public transportation, as she did not drive. She is hearing-impaired and uses a hearing aid. Prior to her disappearance, she exhibited signs of dementia, though she remained functional. Her whereabouts remain unknown.