U.S. actor Frankie Muniz announced via Twitter he has suffered his second "mini stroke" in less than a year. "Almost a year to the day, I experienced another mini stroke," Muniz, 27, tweeted Monday. "Hopefully that will be the last. Miserable." No other details about his condition or where he is recovering from his illness were immediately available. Muniz is best known for his work on the sitcom, "Malcolm in the Middle," opposite Bryan Cranston. He is also a race-car driver and a musician.