Etta James -- famous for her incredible rendition of "At Last" -- is "terminally ill" ... so says her live-in doctor ... who is now asking fans to pray for the 73-year-old singer.
According to the doctor, Etta's chronic leukemia was declared incurable two weeks ago.
Etta -- whose health has been on a rapid decline the last few years -- was hospitalized in May over a life-threatening blood infection. Months before, the singer was diagnosed with both dementia and leukemia.
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