Louise A. Mercer, age 88, of Gary, SD passed away Sunday, September 5, 2021 at the Sanford Canby Medical Center. Funeral service will be 11:00 a.m. Friday, September 10, 2021 at the United Methodist Church in Gary, SD with visitation one hour prior to the service. Burial will be in the Grandview Cemetery, Gary, South Dakota.  Houseman Funeral Home in Clear Lake, SD is entrusted with the arrangements.