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RIVERDALE, Ga. -- Police have not given up hope of finding a 78-year-old Riverdale woman who disappeared Sept. 4, 2011.

Pat C. Moss was last seen at her condo on Redland Drive. Her daughter told police she dropped her mother off there the night before she vanished.

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Clayton County Police Officer Danielle Rosa say investigators periodically check hospitals, shelters and other locations throughout the area, but have yet to find any trace of Moss.

The missing woman is described as black, about 6 feet tall and 160 pounds. She speaks with a Caribbean accent. Rosa said Moss also suffers from dementia.

Moss has used several aliases in the past, including Joyce Walker, Joyce Cook, Pat Celena Walker, Pat Celena Ross and Pat Celena Moss.

Anyone who sees Moss or have any information about her disappearance is asked to call 911 or Clayton County Police at 678-610-4711.