Progeria

From Seattle PI:

Seth Cook, who lived in Darrington and captured hearts all over the world, died Monday at his home with his family around him. He was 13 years old and had recently suffered a heart attack as a consequence of progeria, a rare disorder that causes accelerated aging… Because of his disease, Seth stood barely 3 feet tall and weighed less than an average toddler.

Poor kid! (Via TTBlue)