His wife revealed the '90s country singer's diagnosis in a Facebook post on Sunday.
Ketchum's wife Andrea explains that she, her husband and their family decided to share Ketchum's diagnosis because fans have been wondering why he has no future scheduled tour dates, and speculating about the reason for the lack of upcoming shows. Andrea says that her husband has been living with Alzheimer's and dementia "for some time now," but continued performing "because of his love for his fans ... as long as it was possible."
Although Ketchum is dealing with Alzheimer's and dementia, Andrea says that she's continued to read fans' Facebook comments to him and will keep checking in via social media. She does not provide further information about how far progressed Ketchum's diagnosis is.