Marilu Henner — one of only six people in the world diagnosed with Superior Autobiographical Memory — will guest star on CBS' Unforgettable, which stars Poppy Montgomery as a woman with the same perfect-recall ability.

Marilu, who's also a consultant on the show, will play her aunt, a woman diagnosed with early-onset Alzheimer's. "That would be the cruelest thing that could happen to me," says Marilu. "Maybe my version of it would be like what everyone else experiences [in their everyday life]."

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