Larry King will explore Alzheimer’s disease in his first CNN special since stepping down from his nightly talk show.

“Unthinkable: The Alzheimer’s Epidemic,” airing Sunday at 8 p.m., features interviews with several celebrities touched by the disease, including Maria Shriver, whose father, Sargent Shriver, had it, and actor Seth Rogen, whose fiancée’s mother was diagnosed at age 55.

King, who is 77, said he is healthy but, like many older people, Alzheimer’s is in the back of his mind. He is close with former first lady Nancy Reagan, who took care of her husband during his struggle with Alzheimer’s.

More King will look at Alzheimer’s

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