Freddie Prinze Jr.
Everybody remembers this actor from his role in Scooby-Doo 2: Monsters Unleashed which made him very popular. But since getting married to another famous actress, Prinze became a voice actor and stopped appearing in front of cameras.
On November 30, 2012, at age 26, Muniz was hospitalized after having a transient ischemic attack, and spoke about the experience on Katie.[46][47] He suffered a second attack a year later, on 25 November 2013.[48] He was interviewed in 2017 and asked about his health, and said he has had no issues.[49][50] It was revealed on Dancing with the Stars on October 9, 2017, that he, in fact, has suffered significant memory loss, forgetting he starred in his own shows including Malcolm in the Middle.[51]
https://en.wikipedia.org/wiki/Frankie_Muniz
<---this isn't me either