The Brief DeKalb County authorities confirmed that 70-year-old Joanne Howell was found dead at Misty Lake in Ellenwood. Howell, who had Alzheimer's and dementia, was reported missing after leaving her home. A DeKalb County family is grieving after 70-year-old Joanne Howell, who had Alzheimer's and dementia, was found dead Monday morning at Misty Lake in Ellenwood. Shortly before noon, DeKalb County police confirmed the person found deceased was 70-year-old Joanne Howell, who had been reported missing over the weekend. (Credit: DeKalb County Police Department)Howell was last seen at her home, located about a half mile from Misty Lake, late Friday afternoon.